HELP NEEDED. Plugin container stopped working / Script does not respond

Question

Hi!
I am aware that there are numerous articles about this problem, but unfortunately none of them solves my problem.
Very frequently, at least once a day (usually from 3 to even 7 times a day) my Mozilla Firefox freezes and I am forced to restart it. It typically occurs when I try to open a page with some interactive content in it (youtube, some fancy flash pages, even gmail document preview). When I try to close it, Windows pops up a message saying that "Firefox stopped working" and terminates the application itself, and then another window pops up, saying "Plugin Container for Firefox stopped working". It's usually either that, but sometimes Mozilla also shuts itself without any warning and the same message appears.
As for "script does not respond", it does happen as well, although way more seldom. Usually it happens on the pages with lots of images. The whole browser then freezes for couple of seconds, then it pops up a window saying that the script does not respond and asks whether I want to force it to continue or not. It doesn't make any difference which option I choose because usually the browser crashes anyway.
I am using version 34 and I made sure all my plugins and addons are up to date. I also disabled hardware acceleration and tried to reinstall whole flash thing. I wonder whether it's the fault of one of my addons, but I admit I am not too eager to try and disable them all and then test it one by one because it would take up way too much time.
Apart from that, none of the previous solutions seem to help, and the problem really gets on my nerves because numerous times I lost a huge block of text I was writing. Now I learned to copy everything I write couple of times :/
Maybe the crash reports will help. I'll link them from the newest to the oldest (for some weird reason they are 3 crash reports from today, yesterday and 3 days ago - weird, because the browser has shut itself today at least twice, not to mention previous days):
https://crash-stats.mozilla.com/report/index/ba7f5087-3d7d-4b2c-b9b1-04e6d2150105
https://crash-stats.mozilla.com/report/index/72eaf792-5f06-445b-806c-cd7922150104
https://crash-stats.mozilla.com/report/index/c3f81ff8-df10-45a6-8400-1c5912150103
I'll be glad for any help because, honestly, I can't stand it anymore. No reinstalling of Firefox or restoring settings to default have helped me yet.

Answer 1

Hmm, that's pretty bad. Often if Windows is stepping in with the crash report, then the issue is with a driver incompatibility, most commonly a display driver.
Here are a couple things to try:
(1) Disable Firefox from using hardware acceleration
This is the traditional workaround. You can use:
"3-bar" menu button (or Tools menu) > Options > Advanced
On the "General" mini-tab, uncheck the box for "Use hardware acceleration when available"
That takes effect the next time you exit and start Firefox up again, which the way you describe it, might be quite soon.
(2) Disable the Flash player plugin from using hardware acceleration
This is a separate setting. See this support article from Adobe: http://helpx.adobe.com/flash-player/kb/video-playback-issues.html#main_Solve_video_playback_issues
(3) Disable the Flash plugin's protected mode feature
Protected mode has security benefits, but is not compatible with all systems for some reason. It can stall scripts on some systems, for example. You can disable the feature by creating or editing a settings file. The following pages/posts provide different approaches:
* Adobe support article under the heading "Last Resort": [http://forums.adobe.com/message/4468493#TemporaryWorkaround Adobe Forums: How do I troubleshoot Flash Player's protected mode for Firefox?]
* Manual steps: https://support.mozilla.org/questions/968190?page=5#answer-509209
* Batch file to automate the manual steps: https://support.mozilla.org/questions/982093#answer-518078 (alternate version of Carm's batch file with a few changes by me: [https://onedrive.live.com/?cid=f7d304d92388737d&id=F7D304D92388737D!336&ithint=file,.bat&authkey=!AP2FXW2Y_3BXZyo])
Any improvement?