Firefox+Flash: Some flash applets' content doesn't get updated

Hello community,
I stumbled upon a very strange problem with Firefox and Flash. Some flash applets (example: http://www.kenken.com/game) show only a plain white rectangle. For a long time I thought that it is a problem with Flashblock and/or NoScript. Today, however, I tried to get rid of the problem and made following observations:
1. The problem persists in safe mode (with deactivated extensions).
2. The problem persists after disabling hardware acceleration in the Firefox settings.
3. The problem does NOT occur in Chromium&Pepper Flash. But I'd like to stick to Firefox for many reasons.
4. The problem does NOT occur on my laptop running Manjaro (however, the setups are not really comparable).
5. Initially I thought that the flash applets aren't initialized at all, however, now I observed that if I switch to a different tab and then back to the tab with the flash applet, it gets updated. I can also interact with the applet, however, the changes are only visible after I do the tab switching.
Any help or hint how to find the cause of the problem is greatly appreciated!
Thanks in advance,
PhotonX

A new finding: I tried to install an older version of Firefox and downloaded a binary from https://ftp.mozilla.org/pub/mozilla.org … /releases/. The older binary worked so I tried newer ones and finally arrived at the very same version as the one installed through the package management. The result is: The 33.0.2 binary downloaded from Mozilla works, the 33.0.2 installed through the package management doesn't! All extensions installed on my machine are available in the downloaded binary, so I assume that it knows about ~/.mozilla. What could be the cause of the problem then? Will try to start Firefox with a completely clean home folder (new user) and report back.
edit: Narrowed down the list of problematic files to this:
$ ls -l /home/photon/.mozilla/firefox/sw0n83fl.default/
insgesamt 94852
-rw------- 1 photon users 94222 31. Okt 11:22 prefs.js
-rw------- 1 photon users 141109 31. Okt 11:17 search.json
-rw------- 1 photon users 734 31. Okt 11:06 search-metadata.json
-rw-r--r-- 1 photon users 65536 19. Jun 2012 search.sqlite
-rw------- 1 photon users 16384 30. Apr 2011 secmod.db
-rw------- 1 photon users 288 31. Okt 11:22 sessionCheckpoints.json
-rw------- 1 photon users 2480 31. Okt 11:22 sessionstore.js
-rw-r--r-- 1 photon users 393216 4. Sep 08:49 signons.sqlite
-rw------- 1 photon users 25 15. Mai 2013 times.json
-rw-r--r-- 1 photon users 62914560 21. Nov 2012 urlclassifier3.sqlite
-rw------- 1 photon users 154 31. Okt 10:26 urlclassifierkey3.txt
-rw-r--r-- 1 photon users 1622446 21. Nov 2012 urlclassifier.pset
-rw-r--r-- 1 photon users 31850496 31. Okt 11:22 webappsstore.sqlite
edit: The problematic file is prefs.js.
Last edited by PhotonX (2014-10-31 10:29:25)

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