The Firefox cache file format is used to store browser cache. This specification is based on the source code and documentation.
This document is intended as a working document for the Firefox cache file format specification.
Author(s): |
Joachim Metz <joachim.metz@gmail.com> |
Abstract: |
Firefox cache file format |
Classification: |
Public |
Keywords: |
Firefox cache |
Copyright (C) 2018, Joachim Metz <joachim.metz@gmail.com>. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".
The Firefox cache directory contains the multiple type of files:
-
Cache map file
-
Cache block file
-
Cache data file
| Characteristics | Description |
|---|---|
Byte order |
big-endian |
Date and time values |
POSIX timestamp in UTC |
Character strings |
Character strings are ASCII encoded |
| Value | Identifier | Description |
|---|---|---|
0x00ffffff |
eBlockNumberMask |
Cache block number |
0x03000000 |
eExtraBlocksMask |
|
0x30000000 |
eLocationSelectorMask |
|
0x4c000000 |
eReservedMask |
Unknown (Reserved) |
0x80000000 |
eLocationInitializedMask |
Is location initialize flag |
| Value | Identifier | Description |
|---|---|---|
0x000000ff |
eFileGenerationMask |
File generation |
0x00ffff00 |
eFileSizeMask |
File size |
0x4f000000 |
eFileReservedMask |
|
0x80000000 |
eLocationInitializedMask |
Is location initialize flag |
0x00000000 not initialized 0x80xxxxyy separate file of size xxxx bytes and generation yy 0x91010003 block file 1, 2 blocks, starting at block 3.
The cache map file is named:
_CACHE_MAP_
It contains:
-
Cache map file header
-
An array of cache records (stored in 32 buckets)
TODO is the file header followed by an array of cache records? In the sample files so far the cache map file is only 276 bytes of size. Presumably because data size is 0?
The file header (nsDiskCacheHeader) is 276 bytes of size and consists of:
| Offset | Size | Value | Description |
|---|---|---|---|
0 |
2 |
Major format version |
|
2 |
2 |
Minor format version |
|
4 |
4 |
Data size |
|
8 |
4 |
Number of entries |
|
12 |
4 |
Is dirty flag |
|
16 |
4 |
Number of cache records Contains a signed integer |
|
20 |
32 x 4 = 128 |
Eviction rank array |
|
148 |
32 x 4 = 128 |
Bucket usage array |
| Value | Identifier | Description |
|---|---|---|
1.5 |
Mozilla 1.7 |
|
1.6 |
Mozilla 1.8 |
|
1.8 |
Firefox 2.# (Mozilla 1.8) |
|
1.11 |
Firefox 3.5 (Mozilla 1.9.1) |
|
1.12 |
Firefox 3.6 (Mozilla 1.9.2) |
|
1.19 |
Firefox 4.0 (Mozilla 2.0) |
|
Note
|
The format version is defined in nsDiskCache.h |
The cache record (nsDiskCacheRecord) is 16 bytes of size and consists of:
| Offset | Size | Value | Description |
|---|---|---|---|
0 |
4 |
Hash number |
|
4 |
4 |
Eviction rank |
|
8 |
4 |
Data location |
|
12 |
4 |
Metadata location |
The cache block file is named:
_CACHE_00#_
Where # is a number ranging from [1-3].
-
CACHE_001contains blocks of size 256 bytes -
CACHE_002contains blocks of size 1024 bytes -
CACHE_003contains blocks of size 4096 bytes
|
Note
|
Up to 4 contiguous blocks in the file may be used by a single entry. |
It contains:
-
A bitmap
-
Cached data blocks
The cache entry (nsDiskCacheEntry) is 32 bytes of size and consists of:
| Offset | Size | Value | Description |
|---|---|---|---|
0 |
2 |
Major format version |
|
2 |
2 |
Minor format version |
|
4 |
4 |
Metadata location |
|
8 |
4 |
Fetch count |
|
12 |
4 |
Last fetched date and time |
|
16 |
4 |
Last modification date and time |
|
16 |
4 |
Expiration date and time |
|
20 |
4 |
Data size |
|
24 |
4 |
Key size |
|
28 |
4 |
Meta data size |
The (separate) cache data file is named:
<hash number><type><generation number>
Where <hash number>, <type>, <generation number> are placeholders for the corresponding values.
TODO: document Firefox cache version 2
cache2/index cache2/doomed/* cache2/entries/*
| Characteristics | Description |
|---|---|
Byte order |
big-endian |
Date and time values |
POSIX timestamp in UTC |
Character strings |
Character strings are ASCII encoded |
The cache index header (CacheIndexHeader) is 12 bytes of size and consists of:
| Offset | Size | Value | Description |
|---|---|---|---|
0 |
4 |
Index version (sequence number) |
|
4 |
4 |
Last modification date and time |
|
8 |
4 |
Is dirty flag |
The cache index header (CacheIndexHeader) is 12 bytes of size and consists of:
| Offset | Size | Value | Description |
|---|---|---|---|
0 |
20 |
Cache record hash |
|
20 |
4 |
Unknown (Frequency) |
|
24 |
4 |
Expiration date and time |
struct CacheIndexRecord {
54 SHA1Sum::Hash mHash;
55 uint32_t mFrecency;
56 uint32_t mExpirationTime;
57 uint32_t mAppId;
58
59 /*
60 * 1000 0000 0000 0000 0000 0000 0000 0000 : initialized
61 * 0100 0000 0000 0000 0000 0000 0000 0000 : anonymous
62 * 0010 0000 0000 0000 0000 0000 0000 0000 : inBrowser
63 * 0001 0000 0000 0000 0000 0000 0000 0000 : removed
64 * 0000 1000 0000 0000 0000 0000 0000 0000 : dirty
65 * 0000 0100 0000 0000 0000 0000 0000 0000 : fresh
66 * 0000 0011 0000 0000 0000 0000 0000 0000 : reserved
67 * 0000 0000 1111 1111 1111 1111 1111 1111 : file size (in kB)
68 */
69 uint32_t mFlags;
00000000 00 00 00 05 5b 61 3f 86 00 00 00 00 |....[a?.....R/.6| mHash 00000000 52 2f f0 36 |....[a?.....R/.6| 00000010 65 1f ea 29 f2 27 bf b1 4b d9 34 17 5d db a6 2a |e..).'..K.4.]..*| mFrecency 00000020 3b 8d 9c 19 |;....9..^kK.....| mOriginAttrsHash (64-bit) 00000020 da 39 a3 ee |;....9..^kK.....| 00000020 5e 6b 4b 0d |;....9..^kK.....| mExpirationTime 00000020 00 00 00 00 |;....9..^kK.....| mOnStartTime, mOnStopTime 00000030 ff ff ff ff |........$\..s.L.| mFlags 00000030 80 00 00 03 |........$\..s.L.| 00000030 24 5c ed a9 73 b4 4c 04 |........$\..s.L.| 00000040 32 5e 8f 30 63 f7 59 6f 9c 88 f1 20 3b 8d 9c ba |2^.0c.Yo... ;...| 00000050 da 39 a3 ee 5e 6b 4b 0d 57 cb f1 1e ff ff ff ff |.9..^kK.W.......| 00000060 80 00 00 10 9b 45 ce 47 ee 0b 5d 54 8b fa 84 c6 |.....E.G..]T....| 00000070 96 2b 40 49 09 05 44 b2 3f 56 f4 04 da 39 a3 ee |.+@I..D.?V...9..|
struct CacheIndexRecord {
SHA1Sum::Hash mHash;
uint32_t mFrecency;
OriginAttrsHash mOriginAttrsHash;
uint32_t mExpirationTime;
uint16_t mOnStartTime;
uint16_t mOnStopTime;
/*
* 1000 0000 0000 0000 0000 0000 0000 0000 : initialized
* 0100 0000 0000 0000 0000 0000 0000 0000 : anonymous
* 0010 0000 0000 0000 0000 0000 0000 0000 : removed
* 0001 0000 0000 0000 0000 0000 0000 0000 : dirty
* 0000 1000 0000 0000 0000 0000 0000 0000 : fresh
* 0000 0100 0000 0000 0000 0000 0000 0000 : pinned
* 0000 0010 0000 0000 0000 0000 0000 0000 : has cached alt data
* 0000 0001 0000 0000 0000 0000 0000 0000 : reserved
* 0000 0000 1111 1111 1111 1111 1111 1111 : file size (in kB)
*/
uint32_t mFlags;
The cache file metadata header (CacheFileMetadataHeader) is 32 bytes of size and consists of:
| Offset | Size | Value | Description |
|---|---|---|---|
0 |
4 |
Format version |
|
4 |
4 |
Fetch count |
|
8 |
4 |
Last fetched date and time |
|
12 |
4 |
Last modification date and time |
|
16 |
4 |
Unknown (Frequency) |
|
20 |
4 |
Expiration date and time |
|
24 |
4 |
Key size |
|
28 |
4 |
Flags |
Version 2 https://hg.mozilla.org/mozilla-central/annotate/80eff2b52d14/netwerk/cache2/CacheFileMetadata.h#l54
00000000 4e 31 cf 5a |N1.Z........U...|
00000000 00 00 00 01 00 00 00 01 55 ea c3 ff |N1.Z........U...|
00000010 55 ea c3 ff 3b 8d 9c 1a 55 eb 6c bf 00 00 00 e1 |U...;...U.l.....|
00000020 3a 68 74 74 70 73 3a 2f 2f 77 77 77 2e 67 6f 6f |:https://www.goo|
class CacheFileMetadataHeader {
uint32_t mVersion;
uint32_t mFetchCount;
uint32_t mLastFetched;
uint32_t mLastModified;
uint32_t mFrecency;
uint32_t mExpirationTime;
uint32_t mKeySize;
uint32_t mFlags;
Version 2
47 uint32_t mVersion;
48 uint32_t mFetchCount;
49 uint32_t mLastFetched;
50 uint32_t mLastModified;
51 uint32_t mFrecency;
52 uint32_t mExpirationTime;
53 uint32_t mKeySize;
54 uint32_t mFlags;
Version 1
uint32_t mVersion;
18 uint32_t mFetchCount;
19 uint32_t mLastFetched;
20 uint32_t mLastModified;
21 uint32_t mExpirationTime;
22 uint32_t mKeySize;
23 } CacheFileMetadataHeader;
| Title: | Necko/Cache |
|---|---|
URL: |
| Title: | mozilla-central/netwerk/cache/nsDiskCacheMap.h |
|---|---|
URL: |
https://dxr.mozilla.org/mozilla-central/source/netwerk/cache/nsDiskCacheMap.h |
| Title: | mozilla-central/netwerk/cache/nsDiskCacheBlockFile.h |
|---|---|
URL: |
https://dxr.mozilla.org/mozilla-central/source/netwerk/cache/nsDiskCacheBlockFile.h |
| Title: | mozilla-central/netwerk/cache/nsDiskCacheEntry.h |
|---|---|
URL: |
https://dxr.mozilla.org/mozilla-central/source/netwerk/cache/nsDiskCacheEntry.h |
| Title: | mozilla-central/netwerk/cache2 |
|---|---|
URL: |
https://dxr.mozilla.org/mozilla-central/source/netwerk/cache2 |
| Title: | mozilla-central/netwerk/cache2/CacheIndex.h |
|---|---|
URL: |
https://dxr.mozilla.org/mozilla-central/source/netwerk/cache2/CacheIndex.h |
| Title: | mozilla-central/netwerk/cache2/CacheFileMetadata.h |
|---|---|
URL: |
https://dxr.mozilla.org/mozilla-central/source/netwerk/cache2/CacheFileMetadata.h |
| Title: | firefox-cache-forensics - FfFormat |
|---|---|
URL: |
https://code.google.com/archive/p/firefox-cache-forensics/wikis/FfFormat.wiki |
| Title: | Firefox cache2 storage breakdown |
|---|---|
Author(s): |
J. Habben |
URL: |
https://www.guidancesoftware.com/blog/digital-forensics/2015/02/11/firefox-cache2-storage-breakdown |
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