Firefox does not start (not even safemode) but uses CPU

I have the latest Firefox 25.0 (and latest Flash 11.9.900.117) on Windows 7 and the following behavior is reproducible. This started not too long ago.
At first when I start Firefox nothing appears no matter how often I restart. However, in the process list I see firefox.exe at 25% CPU, 2x FlashPlayerPlugin_11_9_900_117.exe (0% CPU) and plugincontainer.exe. No matter how often I kill all of them, Firefox wouldn't restart.
The following does also not help in this situation:
* Starting in normal Safemode: Firefox opens up a Window but freezes immediately and does not respond. The process list shows the the same processes even though I find FlashPlayer unexpected.
* Disable plugincontainer: Same results (just without plugincontainer.exe)
* Deinstall Flash: Same results (just without FlashPlayerPlugin)
The following can start Firefox once only:
* Starting in Safemode but select "Reset Firefox": Firefox won't start right away, though. Nothing happens and you have to kill the processes. However the very next time you start Firefox the normal way, it works fine (but it shows FlashPlayerPlugin.exe in the Windows process list despite not Tab being open). Unfortunately, after closing Firefox the processes (Firefox, FlashPlayerPlugin) are not removed. I kill them and the trouble with Firefox not starting reappears again.

I'm afraid not. As soon as I reset, Firefox disappears however two new FlashPlayerPlugin.exe processes start. Those together with firefox.exe remain as background processes and above cycle is the same.
There is one difference between resetting in safemode-startup (Shift clicking while startup and chosing "Reset") and resetting from the Troubleshooting menu: Only the former allows for a subsequent single normal start (after killing the first attempt as described above).
PS: My extensions did not get lost. Does that mean the "Reset" actually crashed? Also I'm using Sync.
PPS: I've tried disabling all Plugins (Flash etc.). Now when I close Firefox, FlashPlayerPlugin does not remain as a process, however firefox.exe does at 25% CPU. And when I try to restart Firefox, I again get two FlashPlayerPlugin processes with all the above symptoms (Plugins remain disabled in the configuration). This plugin is probably not the cause as I also tried deinstalling it, but it may give an indication where Firefox gets stuck.

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