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I am trying to get a played youtube video from Firefox cache.

I'm using Ubuntu 11.10 and Firfox 7.0.1

Note, Firefox is still open and the video is complete loading

I've tried go to ~/.mozilla/firefox/9qhsyom8.default/Cache but the directory structure seems changed a lot:

hewedy@compu10:~/.mozilla/firefox/9qhsyom8.default/Cache$ ls -l
total 32072
drwx------ 24 mhewedy mhewedy     4096 2012-02-24 09:30 0
drwx------ 32 mhewedy mhewedy     4096 2012-02-24 10:56 1
drwx------ 23 mhewedy mhewedy     4096 2012-02-24 10:57 2
drwx------ 26 mhewedy mhewedy     4096 2012-02-24 05:20 3
drwx------ 19 mhewedy mhewedy     4096 2012-02-24 10:57 4
drwx------ 28 mhewedy mhewedy     4096 2012-02-24 03:37 5
drwx------ 29 mhewedy mhewedy     4096 2012-02-24 10:43 6
drwx------ 29 mhewedy mhewedy     4096 2012-02-24 09:58 7
drwx------ 19 mhewedy mhewedy     4096 2012-02-24 10:56 8
drwx------ 24 mhewedy mhewedy     4096 2012-02-24 10:24 9
drwx------ 25 mhewedy mhewedy     4096 2012-02-24 07:46 A
drwx------ 25 mhewedy mhewedy     4096 2012-02-24 04:15 B
drwx------ 20 mhewedy mhewedy     4096 2012-02-24 10:42 C
-rw-------  1 mhewedy mhewedy  2093091 2012-02-24 10:58 _CACHE_001_
-rw-------  1 mhewedy mhewedy  5627862 2012-02-24 10:58 _CACHE_002_
-rw-------  1 mhewedy mhewedy 25042643 2012-02-24 10:58 _CACHE_003_
-rw-------  1 mhewedy mhewedy      276 2012-02-23 23:41 _CACHE_MAP_
drwx------ 22 mhewedy mhewedy     4096 2012-02-24 10:44 D
drwx------ 25 mhewedy mhewedy     4096 2012-02-24 09:57 E
drwx------ 19 mhewedy mhewedy     4096 2012-02-24 10:44 F

I then tried to copy all files in subdirectories into another directory:

mkdir ~/tmp/dir2 ; cp `find ./ -name "*"` ~/tmp/dir2

After I looked in ~/tmp/dir2 I found very few youtube files but cannot find the file I need.

I've also looked at : /tmp/mozilla-media-cache/ but find no files!

Please don't suggest a youtube download manager

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(I'm using Gentoo, with firefox-10.0.1. Things might be significantly different in your version, I'm not familiar enough with firefox to tell.)

After loading up a video in youtube, I did this:

eroen@falcon ~ $ du .mozilla/firefox/sqaml9dr.default/Cache/ | sort -n
[...]
512 .mozilla/firefox/sqaml9dr.default/Cache/B
532 .mozilla/firefox/sqaml9dr.default/Cache/2
1160    .mozilla/firefox/sqaml9dr.default/Cache/8
14668   .mozilla/firefox/sqaml9dr.default/Cache/7/40
14912   .mozilla/firefox/sqaml9dr.default/Cache/7
23040   .mozilla/firefox/sqaml9dr.default/Cache/
eroen@falcon ~ $ ls -lSr .mozilla/firefox/sqaml9dr.default/Cache/7/40
total 14664
-rw------- 1 eroen users 15014104 Feb 24 11:50 55A2Fd01
eroen@falcon ~ $ mplayer .mozilla/firefox/sqaml9dr.default/Cache/7/40/55A2Fd01

I was then rewarded with a video in a small window of a double rainbow all the way across the sky.

Obviously, the names will be different for you, and unless your cache is clean before you start you will have a bit of trouble finding the correct files. You could clear your cache with something like this:

$ rm -r .mozilla/firefox/????????.default/Cache; \
mkdir .mozilla/firefox/????????.default/Cache

To clarify, I found the cache folder that took up the most space, looked inside it and played the only file there.

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