Hello,

Try Firefox Safe Mode to see if the problem goes away. Firefox Safe Mode is a troubleshooting mode that temporarily turns off hardware acceleration, resets some settings, and disables add-ons (extensions and themes).

You can start Firefox in Safe Mode as follows:

• On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.
• On Mac: Hold the option key while starting Firefox.
• On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode
  (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)

When the Firefox Safe Mode window appears, select "Start in Safe Mode".

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, theme, or hardware acceleration. Please follow the steps in the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to find the cause.

To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help others with the same problem.

no it doesn't start in safe mode and also I tried a fresh install yesterday without addons sync from my account it worked for a couple of hours and then the same thing...crashing at the start cant open in safe cant refresh it and as it seems not even new install

Two of those crash report indicate an AMD Radeon DirectX 11driver issue.

See this: https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration

Updated to beta drivers then after restart i could get in safe mode then i turned off the hardware acceleration and switched the webgl.disabled item to true. After this firefox started normally ty very much for your help. I wish this never happens again.