I have exactly the same. Sometimes it crashes even in Safe Mode. However, it may have something to do with Proxy or connection quality. When I disconnected VPN/Proxy (poor quality connection I had today) it started to work well.

https://support.mozilla.com/en-US/kb/Firefox+crashes#Getting_help_with_your_crash

Type about:crashes in the URL bar and hit Enter.
Click the hyperlinks to bring up the Crash Report pages and copy'n'paste the URL of each of those reports into the message box here. We'll see if we can help you figure out what is causing those crashes to happen.

All reports have URL starting with:

      https://crash-stats.mozilla.com/report/index/

and then one of those :

bp-b0d0fe14-c063-4d0c-a4c7-059de2110308

bp-f6d5d57f-1fba-4f55-a176-884e82110308

bp-d3dee990-e85c-43cd-9fea-c5cf22110308

bp-a4d90c11-3c36-407c-a6f9-a9e912110308

7c6673af-158b-460b-933b-0c3c8eebfeb9

24618be8-4c88-4f21-b2ea-64e81bb5b370

bp-1149b502-c423-49d6-a075-75e862110308

bp-04f99a4a-e5cb-4b6b-bef7-505cb2110308

bp-9f2b56ad-7016-4078-9647-06d2b2110308

bp-1c86a2b1-cd86-44b0-8723-ea6c52110308

bp-40cf4c9d-f722-4216-8932-6bfc22110308

bp-9f291d97-5800-440b-82d6-131ca2110308

bp-315d9eda-decb-4ae0-927f-ccacb2110308

bp-68b1f8ea-c602-4cd1-8d7f-6e0052110308

bp-3033c245-6188-4785-b838-a694b2110304

bp-988b563d-ebed-4c42-aae7-25f7d2110304

bp-a93cb815-6f27-417d-a66b-e6ac82110304

bp-db8f75e0-8436-45b0-aaae-de2aa2110304

bp-07bf2d58-1b56-467d-8e8a-566d42110304

bp-55d0d053-f54d-43af-9506-0a78a2110304

7ecfa3ff-0d4e-4ab7-aece-3c9abcb8f815

5e0b079c-7cdb-48a8-ba69-ac6fdddbac55

bp-05a02a3d-6e5a-456c-913b-b5cb92110303

bp-f25a55be-3c89-4e89-a45f-9c0292110303

bp-b429c88f-0fe3-4f51-9cbe-7f99b2110303

bp-e330461a-c180-48cd-a367-91d732110303

bp-6f0098d1-c9d1-42c1-96e5-421eb2110303

1f9b3fe1-b08c-44c9-ac46-cf68d848c2e1

bp-edce604d-3570-4481-b8fd-bc0e92110303

These are not all crashes - I stopped sending the report 'cause takes to much time.

Hi again.

Ok. Seems, I managed to fix it, however, it's difficult to say how exactly:). What I did is:

• I removed everything Adobe's from Firefox and OS.
• I took sysinternals/autoruns.exe and I removed everything that looked as Adobe's (not too deep – classes, dlls I did not touch) .
• From autoruns, I removed also everything MS Office Groove – like. Don't ask me why. I just did not like it.
• And I did some general autoruns cleansing as well – it's always good to do.
• Then I tested if FF was still crashing and it wasn't.
• Then, I installed Adobe Reader but not the newest version but some 10.0.x (downloaded from "older versions link").

So now I have Flash plugin v10.0 r32 and Adobe Reader 10.0.1 and everything works without any crashes. 

Aha – I can only imagine how it was connected to VPN, proxy, etc – I did not do anything about it.

Nuxar as I mentioned I just installed the lattest version of Firefox and it's working fine. Your solution may have worked but was way too complicated for me.

Thanks for your reply though.

dycon