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21

9

There seems to be various JavaScript+browser specific ways of decompressing this, but isn't there some way to transform jsonlz4 files to something unlz4 will read?

firefox compression lz4

share|improve this question

asked Nov 29 '16 at 20:15

l0b0l0b0

30.3k2323 gold badges129129 silver badges264264 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Cross reference: Reading "jsonlz4" bookmarkbackup files • mozillaZine Forums (2014-11-04)
  
  – Graham Perrin
  Oct 19 '17 at 1:28
  

  
  
  
  

add a comment | 

21

9

There seems to be various JavaScript+browser specific ways of decompressing this, but isn't there some way to transform jsonlz4 files to something unlz4 will read?

firefox compression lz4

share|improve this question

asked Nov 29 '16 at 20:15

l0b0l0b0

30.3k2323 gold badges129129 silver badges264264 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Cross reference: Reading "jsonlz4" bookmarkbackup files • mozillaZine Forums (2014-11-04)
  
  – Graham Perrin
  Oct 19 '17 at 1:28
  

  
  
  
  

add a comment | 

There seems to be various JavaScript+browser specific ways of decompressing this, but isn't there some way to transform jsonlz4 files to something unlz4 will read?

firefox compression lz4

share|improve this question

asked Nov 29 '16 at 20:15

l0b0l0b0

30.3k2323 gold badges129129 silver badges264264 bronze badges

share|improve this question

asked Nov 29 '16 at 20:15

l0b0l0b0

30.3k2323 gold badges129129 silver badges264264 bronze badges

share|improve this question

asked Nov 29 '16 at 20:15

l0b0l0b0

30.3k2323 gold badges129129 silver badges264264 bronze badges

asked Nov 29 '16 at 20:15

l0b0l0b0

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asked Nov 29 '16 at 20:15

l0b0l0b0

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4 Answers
4

active

oldest

votes

17

I was able to unpack the jsonlz4 by using lz4json:

apt-get install liblz4-dev

git clone https://github.com/andikleen/lz4json.git

cd lz4json

make

./lz4jsoncat ~/.mozilla/firefox/*/bookmarkbackups/*.jsonlz4

share|improve this answer

edited Jan 20 '17 at 22:28

l0b0

30.3k2323 gold badges129129 silver badges264264 bronze badges

answered Jan 20 '17 at 13:19

RolfRolf

18611 silver badge33 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  The andikleen solution is also good for .json.mozlz4 files e.g. as shown at github.com/andikleen/lz4json/issues/1#issuecomment-336729026 (note to self: remember, remember, gmake on FreeBSD …).
  
  – Graham Perrin
  Oct 15 '17 at 18:02
  
  
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Also: bugzilla.mozilla.org/show_bug.cgi?id=1209390#c4 (2016-05-13) under Mozilla bug 1209390 - Use standard lz4 file format instead of the non-standard jsonlz4/mozlz4 draws attention to avih/dejsonlz4: Decompress Mozilla Firefox bookmarks backup files
  
  – Graham Perrin
  Oct 19 '17 at 1:40
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  FWIW, andikleen's tool failed to compile, with the error "undefined reference to LZ4_decompress_safe_partial" (I did install liblz4-dev prior to building it). avih's tool, OTOH, worked perfectly for me.
  
  – waldyrious
  Nov 6 '17 at 17:48
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Isn't it ironic that an open-web org is using a proprietary compression format for user's data, making it non-trivial to examine your own data?!
  
  – cnst
  May 8 '18 at 4:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Graham-Perrin : dejsonlz4 worked very well for me. It doesn't "transform jsonlz4 files to something unlz4 will read" as requested but directly decompresses them. It would be good to make it a real answer to make it more visible.
  
  – mivk
  Jun 18 '18 at 18:26
  

  
  
  
  

 | 
show 1 more comment

14

Save this script in a file, e.g., mozlz4:

#!/usr/bin/env python

from sys import *

import os

try:

    import lz4.block as lz4

except ImportError:

    import lz4



stdin = os.fdopen(stdin.fileno(), 'rb')

stdout = os.fdopen(stdout.fileno(), 'wb')



if argv[1:] == ['-c']:

    stdout.write(b'mozLz40' + lz4.compress(stdin.read()))

elif argv[1:] == ['-d']:

    assert stdin.read(8) == b'mozLz40'

    stdout.write(lz4.decompress(stdin.read()))

else:

    stderr.write('Usage: %s -c|-d < infile > outfilen' % argv[0])

    stderr.write('Compress or decompress Mozilla-flavor LZ4 files.nn')

    stderr.write('Examples:n')

    stderr.write('t%s -d < infile.json.mozlz4 > outfile.jsonn' % argv[0])

    stderr.write('t%s -c < infile.json > outfile.json.mozlz4n' % argv[0])

    exit(1)

share|improve this answer

edited yesterday

xiota

14299 bronze badges

answered Apr 1 '18 at 19:11

Håkon A. HjortlandHåkon A. Hjortland

24122 silver badges44 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I had to change import lz4 to import lz4.block as lz4, but it still didn't work. Some bytes vs string related error. OTOH this script worked with the import change: gist.github.com/Tblue/62ff47bef7f894e92ed5
  
  – user31389
  Apr 19 '18 at 11:45
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @user31389: I updated the script. Does it work now?
  
  – Håkon A. Hjortland
  Apr 20 '18 at 21:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Wasn't working for me until I did $ pip install lz4.
  
  – Daniel
  Jun 14 at 23:51
  

  
  
  
  

add a comment | 

5

Actually almost all Firefox profile lz4 files are mozlz4 files. It means they have the same "file format header".
Except one file. I talk about webext.sc.lz4 file. It has mozJSSCLz40v001 file header and maybe some sc packaging to pack group of files to on byte stream.

There is a Firefox addon to read or compress .mozlz4 text files mozlz4-edit

share|improve this answer

edited Aug 6 '18 at 15:19

hlovdal

51255 silver badges99 bronze badges

answered Mar 24 '18 at 19:18

user282490

add a comment | 

3

Sufficiently persistent Googling for this turns up a lot of solutions, but most of them seem to be either (a) broken by subsequent changes to underlying libraries, or (b) unnecessarily complex (at least to my personal taste), making them clunky to drop into existing code.

The following appears to work at least on Python 2.7 and 3.6 using a recent version of the Python LZ4 bindings:

def mozlz4_to_text(filepath):

    # Given the path to a "mozlz4", "jsonlz4", "baklz4" etc. file, 

    # return the uncompressed text.

    import lz4.block

    bytestream = open(filepath, "rb")

    bytestream.read(8)  # skip past the b"mozLz40" header

    valid_bytes = bytestream.read()

    text = lz4.block.decompress(valid_bytes)

    return text

Of course this does not attempt to validate inputs (or outputs), is not intended to be secure, etc., but if one just wants to be able to parse one's own FF data, it gets the basic job done.

Command line version here, which could be saved in the relevant directory and invoked from the command line as:

chmod +x mozlz4.py

./mozlz4.py <file you want to read> <file to save output to>

share|improve this answer

answered Jan 31 at 6:53

Samuel HendersonSamuel Henderson

3122 bronze badges

add a comment | 

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17

I was able to unpack the jsonlz4 by using lz4json:

apt-get install liblz4-dev

git clone https://github.com/andikleen/lz4json.git

cd lz4json

make

./lz4jsoncat ~/.mozilla/firefox/*/bookmarkbackups/*.jsonlz4

share|improve this answer

edited Jan 20 '17 at 22:28

l0b0

30.3k2323 gold badges129129 silver badges264264 bronze badges

answered Jan 20 '17 at 13:19

RolfRolf

18611 silver badge33 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  The andikleen solution is also good for .json.mozlz4 files e.g. as shown at github.com/andikleen/lz4json/issues/1#issuecomment-336729026 (note to self: remember, remember, gmake on FreeBSD …).
  
  – Graham Perrin
  Oct 15 '17 at 18:02
  
  
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Also: bugzilla.mozilla.org/show_bug.cgi?id=1209390#c4 (2016-05-13) under Mozilla bug 1209390 - Use standard lz4 file format instead of the non-standard jsonlz4/mozlz4 draws attention to avih/dejsonlz4: Decompress Mozilla Firefox bookmarks backup files
  
  – Graham Perrin
  Oct 19 '17 at 1:40
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  FWIW, andikleen's tool failed to compile, with the error "undefined reference to LZ4_decompress_safe_partial" (I did install liblz4-dev prior to building it). avih's tool, OTOH, worked perfectly for me.
  
  – waldyrious
  Nov 6 '17 at 17:48
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Isn't it ironic that an open-web org is using a proprietary compression format for user's data, making it non-trivial to examine your own data?!
  
  – cnst
  May 8 '18 at 4:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Graham-Perrin : dejsonlz4 worked very well for me. It doesn't "transform jsonlz4 files to something unlz4 will read" as requested but directly decompresses them. It would be good to make it a real answer to make it more visible.
  
  – mivk
  Jun 18 '18 at 18:26
  

  
  
  
  

 | 
show 1 more comment

17

I was able to unpack the jsonlz4 by using lz4json:

apt-get install liblz4-dev

git clone https://github.com/andikleen/lz4json.git

cd lz4json

make

./lz4jsoncat ~/.mozilla/firefox/*/bookmarkbackups/*.jsonlz4

share|improve this answer

edited Jan 20 '17 at 22:28

l0b0

30.3k2323 gold badges129129 silver badges264264 bronze badges

answered Jan 20 '17 at 13:19

RolfRolf

18611 silver badge33 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  The andikleen solution is also good for .json.mozlz4 files e.g. as shown at github.com/andikleen/lz4json/issues/1#issuecomment-336729026 (note to self: remember, remember, gmake on FreeBSD …).
  
  – Graham Perrin
  Oct 15 '17 at 18:02
  
  
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Also: bugzilla.mozilla.org/show_bug.cgi?id=1209390#c4 (2016-05-13) under Mozilla bug 1209390 - Use standard lz4 file format instead of the non-standard jsonlz4/mozlz4 draws attention to avih/dejsonlz4: Decompress Mozilla Firefox bookmarks backup files
  
  – Graham Perrin
  Oct 19 '17 at 1:40
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  FWIW, andikleen's tool failed to compile, with the error "undefined reference to LZ4_decompress_safe_partial" (I did install liblz4-dev prior to building it). avih's tool, OTOH, worked perfectly for me.
  
  – waldyrious
  Nov 6 '17 at 17:48
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Isn't it ironic that an open-web org is using a proprietary compression format for user's data, making it non-trivial to examine your own data?!
  
  – cnst
  May 8 '18 at 4:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Graham-Perrin : dejsonlz4 worked very well for me. It doesn't "transform jsonlz4 files to something unlz4 will read" as requested but directly decompresses them. It would be good to make it a real answer to make it more visible.
  
  – mivk
  Jun 18 '18 at 18:26
  

  
  
  
  

 | 
show 1 more comment

I was able to unpack the jsonlz4 by using lz4json:

apt-get install liblz4-dev

git clone https://github.com/andikleen/lz4json.git

cd lz4json

make

./lz4jsoncat ~/.mozilla/firefox/*/bookmarkbackups/*.jsonlz4

share|improve this answer

edited Jan 20 '17 at 22:28

l0b0

30.3k2323 gold badges129129 silver badges264264 bronze badges

answered Jan 20 '17 at 13:19

RolfRolf

18611 silver badge33 bronze badges

apt-get install liblz4-dev

git clone https://github.com/andikleen/lz4json.git

cd lz4json

make

./lz4jsoncat ~/.mozilla/firefox/*/bookmarkbackups/*.jsonlz4

share|improve this answer

edited Jan 20 '17 at 22:28

l0b0

30.3k2323 gold badges129129 silver badges264264 bronze badges

answered Jan 20 '17 at 13:19

RolfRolf

18611 silver badge33 bronze badges

edited Jan 20 '17 at 22:28

l0b0

30.3k2323 gold badges129129 silver badges264264 bronze badges

edited Jan 20 '17 at 22:28

l0b0

30.3k2323 gold badges129129 silver badges264264 bronze badges

answered Jan 20 '17 at 13:19

RolfRolf

18611 silver badge33 bronze badges

answered Jan 20 '17 at 13:19

RolfRolf

18611 silver badge33 bronze badges

14

Save this script in a file, e.g., mozlz4:

#!/usr/bin/env python

from sys import *

import os

try:

    import lz4.block as lz4

except ImportError:

    import lz4



stdin = os.fdopen(stdin.fileno(), 'rb')

stdout = os.fdopen(stdout.fileno(), 'wb')



if argv[1:] == ['-c']:

    stdout.write(b'mozLz40' + lz4.compress(stdin.read()))

elif argv[1:] == ['-d']:

    assert stdin.read(8) == b'mozLz40'

    stdout.write(lz4.decompress(stdin.read()))

else:

    stderr.write('Usage: %s -c|-d < infile > outfilen' % argv[0])

    stderr.write('Compress or decompress Mozilla-flavor LZ4 files.nn')

    stderr.write('Examples:n')

    stderr.write('t%s -d < infile.json.mozlz4 > outfile.jsonn' % argv[0])

    stderr.write('t%s -c < infile.json > outfile.json.mozlz4n' % argv[0])

    exit(1)

share|improve this answer

edited yesterday

xiota

14299 bronze badges

answered Apr 1 '18 at 19:11

Håkon A. HjortlandHåkon A. Hjortland

24122 silver badges44 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I had to change import lz4 to import lz4.block as lz4, but it still didn't work. Some bytes vs string related error. OTOH this script worked with the import change: gist.github.com/Tblue/62ff47bef7f894e92ed5
  
  – user31389
  Apr 19 '18 at 11:45
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @user31389: I updated the script. Does it work now?
  
  – Håkon A. Hjortland
  Apr 20 '18 at 21:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Wasn't working for me until I did $ pip install lz4.
  
  – Daniel
  Jun 14 at 23:51
  

  
  
  
  

add a comment | 

14

Save this script in a file, e.g., mozlz4:

#!/usr/bin/env python

from sys import *

import os

try:

    import lz4.block as lz4

except ImportError:

    import lz4



stdin = os.fdopen(stdin.fileno(), 'rb')

stdout = os.fdopen(stdout.fileno(), 'wb')



if argv[1:] == ['-c']:

    stdout.write(b'mozLz40' + lz4.compress(stdin.read()))

elif argv[1:] == ['-d']:

    assert stdin.read(8) == b'mozLz40'

    stdout.write(lz4.decompress(stdin.read()))

else:

    stderr.write('Usage: %s -c|-d < infile > outfilen' % argv[0])

    stderr.write('Compress or decompress Mozilla-flavor LZ4 files.nn')

    stderr.write('Examples:n')

    stderr.write('t%s -d < infile.json.mozlz4 > outfile.jsonn' % argv[0])

    stderr.write('t%s -c < infile.json > outfile.json.mozlz4n' % argv[0])

    exit(1)

share|improve this answer

edited yesterday

xiota

14299 bronze badges

answered Apr 1 '18 at 19:11

Håkon A. HjortlandHåkon A. Hjortland

24122 silver badges44 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I had to change import lz4 to import lz4.block as lz4, but it still didn't work. Some bytes vs string related error. OTOH this script worked with the import change: gist.github.com/Tblue/62ff47bef7f894e92ed5
  
  – user31389
  Apr 19 '18 at 11:45
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @user31389: I updated the script. Does it work now?
  
  – Håkon A. Hjortland
  Apr 20 '18 at 21:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Wasn't working for me until I did $ pip install lz4.
  
  – Daniel
  Jun 14 at 23:51
  

  
  
  
  

add a comment | 

Save this script in a file, e.g., mozlz4:

#!/usr/bin/env python

from sys import *

import os

try:

    import lz4.block as lz4

except ImportError:

    import lz4



stdin = os.fdopen(stdin.fileno(), 'rb')

stdout = os.fdopen(stdout.fileno(), 'wb')



if argv[1:] == ['-c']:

    stdout.write(b'mozLz40' + lz4.compress(stdin.read()))

elif argv[1:] == ['-d']:

    assert stdin.read(8) == b'mozLz40'

    stdout.write(lz4.decompress(stdin.read()))

else:

    stderr.write('Usage: %s -c|-d < infile > outfilen' % argv[0])

    stderr.write('Compress or decompress Mozilla-flavor LZ4 files.nn')

    stderr.write('Examples:n')

    stderr.write('t%s -d < infile.json.mozlz4 > outfile.jsonn' % argv[0])

    stderr.write('t%s -c < infile.json > outfile.json.mozlz4n' % argv[0])

    exit(1)

share|improve this answer

edited yesterday

xiota

14299 bronze badges

answered Apr 1 '18 at 19:11

Håkon A. HjortlandHåkon A. Hjortland

24122 silver badges44 bronze badges

#!/usr/bin/env python

from sys import *

import os

try:

    import lz4.block as lz4

except ImportError:

    import lz4



stdin = os.fdopen(stdin.fileno(), 'rb')

stdout = os.fdopen(stdout.fileno(), 'wb')



if argv[1:] == ['-c']:

    stdout.write(b'mozLz40' + lz4.compress(stdin.read()))

elif argv[1:] == ['-d']:

    assert stdin.read(8) == b'mozLz40'

    stdout.write(lz4.decompress(stdin.read()))

else:

    stderr.write('Usage: %s -c|-d < infile > outfilen' % argv[0])

    stderr.write('Compress or decompress Mozilla-flavor LZ4 files.nn')

    stderr.write('Examples:n')

    stderr.write('t%s -d < infile.json.mozlz4 > outfile.jsonn' % argv[0])

    stderr.write('t%s -c < infile.json > outfile.json.mozlz4n' % argv[0])

    exit(1)

share|improve this answer

edited yesterday

xiota

14299 bronze badges

answered Apr 1 '18 at 19:11

Håkon A. HjortlandHåkon A. Hjortland

24122 silver badges44 bronze badges

edited yesterday

xiota

14299 bronze badges

edited yesterday

xiota

14299 bronze badges

answered Apr 1 '18 at 19:11

Håkon A. HjortlandHåkon A. Hjortland

24122 silver badges44 bronze badges

answered Apr 1 '18 at 19:11

Håkon A. HjortlandHåkon A. Hjortland

24122 silver badges44 bronze badges

5

Actually almost all Firefox profile lz4 files are mozlz4 files. It means they have the same "file format header".
Except one file. I talk about webext.sc.lz4 file. It has mozJSSCLz40v001 file header and maybe some sc packaging to pack group of files to on byte stream.

There is a Firefox addon to read or compress .mozlz4 text files mozlz4-edit

share|improve this answer

edited Aug 6 '18 at 15:19

hlovdal

51255 silver badges99 bronze badges

answered Mar 24 '18 at 19:18

user282490

add a comment | 

5

Actually almost all Firefox profile lz4 files are mozlz4 files. It means they have the same "file format header".
Except one file. I talk about webext.sc.lz4 file. It has mozJSSCLz40v001 file header and maybe some sc packaging to pack group of files to on byte stream.

There is a Firefox addon to read or compress .mozlz4 text files mozlz4-edit

share|improve this answer

edited Aug 6 '18 at 15:19

hlovdal

51255 silver badges99 bronze badges

answered Mar 24 '18 at 19:18

user282490

add a comment | 

Actually almost all Firefox profile lz4 files are mozlz4 files. It means they have the same "file format header".
Except one file. I talk about webext.sc.lz4 file. It has mozJSSCLz40v001 file header and maybe some sc packaging to pack group of files to on byte stream.

There is a Firefox addon to read or compress .mozlz4 text files mozlz4-edit

share|improve this answer

edited Aug 6 '18 at 15:19

hlovdal

51255 silver badges99 bronze badges

answered Mar 24 '18 at 19:18

user282490

share|improve this answer

edited Aug 6 '18 at 15:19

hlovdal

51255 silver badges99 bronze badges

answered Mar 24 '18 at 19:18

user282490

edited Aug 6 '18 at 15:19

hlovdal

51255 silver badges99 bronze badges

edited Aug 6 '18 at 15:19

hlovdal

51255 silver badges99 bronze badges

3

Sufficiently persistent Googling for this turns up a lot of solutions, but most of them seem to be either (a) broken by subsequent changes to underlying libraries, or (b) unnecessarily complex (at least to my personal taste), making them clunky to drop into existing code.

The following appears to work at least on Python 2.7 and 3.6 using a recent version of the Python LZ4 bindings:

def mozlz4_to_text(filepath):

    # Given the path to a "mozlz4", "jsonlz4", "baklz4" etc. file, 

    # return the uncompressed text.

    import lz4.block

    bytestream = open(filepath, "rb")

    bytestream.read(8)  # skip past the b"mozLz40" header

    valid_bytes = bytestream.read()

    text = lz4.block.decompress(valid_bytes)

    return text

Of course this does not attempt to validate inputs (or outputs), is not intended to be secure, etc., but if one just wants to be able to parse one's own FF data, it gets the basic job done.

Command line version here, which could be saved in the relevant directory and invoked from the command line as:

chmod +x mozlz4.py

./mozlz4.py <file you want to read> <file to save output to>

share|improve this answer

answered Jan 31 at 6:53

Samuel HendersonSamuel Henderson

3122 bronze badges

add a comment | 

3

Sufficiently persistent Googling for this turns up a lot of solutions, but most of them seem to be either (a) broken by subsequent changes to underlying libraries, or (b) unnecessarily complex (at least to my personal taste), making them clunky to drop into existing code.

The following appears to work at least on Python 2.7 and 3.6 using a recent version of the Python LZ4 bindings:

def mozlz4_to_text(filepath):

    # Given the path to a "mozlz4", "jsonlz4", "baklz4" etc. file, 

    # return the uncompressed text.

    import lz4.block

    bytestream = open(filepath, "rb")

    bytestream.read(8)  # skip past the b"mozLz40" header

    valid_bytes = bytestream.read()

    text = lz4.block.decompress(valid_bytes)

    return text

Of course this does not attempt to validate inputs (or outputs), is not intended to be secure, etc., but if one just wants to be able to parse one's own FF data, it gets the basic job done.

Command line version here, which could be saved in the relevant directory and invoked from the command line as:

chmod +x mozlz4.py

./mozlz4.py <file you want to read> <file to save output to>

share|improve this answer

answered Jan 31 at 6:53

Samuel HendersonSamuel Henderson

3122 bronze badges

add a comment | 

Sufficiently persistent Googling for this turns up a lot of solutions, but most of them seem to be either (a) broken by subsequent changes to underlying libraries, or (b) unnecessarily complex (at least to my personal taste), making them clunky to drop into existing code.

The following appears to work at least on Python 2.7 and 3.6 using a recent version of the Python LZ4 bindings:

def mozlz4_to_text(filepath):

    # Given the path to a "mozlz4", "jsonlz4", "baklz4" etc. file, 

    # return the uncompressed text.

    import lz4.block

    bytestream = open(filepath, "rb")

    bytestream.read(8)  # skip past the b"mozLz40" header

    valid_bytes = bytestream.read()

    text = lz4.block.decompress(valid_bytes)

    return text

Of course this does not attempt to validate inputs (or outputs), is not intended to be secure, etc., but if one just wants to be able to parse one's own FF data, it gets the basic job done.

Command line version here, which could be saved in the relevant directory and invoked from the command line as:

chmod +x mozlz4.py

./mozlz4.py <file you want to read> <file to save output to>

share|improve this answer

answered Jan 31 at 6:53

Samuel HendersonSamuel Henderson

3122 bronze badges

def mozlz4_to_text(filepath):

    # Given the path to a "mozlz4", "jsonlz4", "baklz4" etc. file, 

    # return the uncompressed text.

    import lz4.block

    bytestream = open(filepath, "rb")

    bytestream.read(8)  # skip past the b"mozLz40" header

    valid_bytes = bytestream.read()

    text = lz4.block.decompress(valid_bytes)

    return text

chmod +x mozlz4.py

./mozlz4.py <file you want to read> <file to save output to>

share|improve this answer

answered Jan 31 at 6:53

Samuel HendersonSamuel Henderson

3122 bronze badges

answered Jan 31 at 6:53

Samuel HendersonSamuel Henderson

3122 bronze badges

answered Jan 31 at 6:53

Samuel HendersonSamuel Henderson

3122 bronze badges