Hello,

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

If Firefox is open, you can restart in Firefox Safe Mode from the Help menu:

• In Firefox 29.0 and above, click the menu button , click Help and select Restart with Add-ons Disabled.
• In previous Firefox versions, click on the Firefox button at the top left of the Firefox window and click on Help (or click on Help in the Menu bar, if you don't have a Firefox button) then click on Restart with Add-ons Disabled.

If Firefox is not running, 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, and you need to figure out which one. Please follow 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.

Tried safe mode. no different.

https://crash-stats.mozilla.com/report/index/bp-fdf69c3e-ed61-478e-a6a2-7078e2140519

Can you try to start Firefox in Safe Mode to see if Firefox works properly with no error? You can start Firefox in Safe Mode below:

• Windows/Mac: Go to Help > Restart with add-ons disabled
• Linux: Run firefox -safe-mode in the Terminal/Konsole

If Firefox opens up fine with no problems, it's probably one of your extensions that's causing the issue. You can re-enable your add-ons one by one until you find the one that causes the issue upon being re-enabled.

As per previous post. Tried safe mode. Crashed the same way. i.e. trying save(download) an attachment from web based email. Crash report for that is in previous post also.

Add ons or plug ins. dont have any add ons enabled, well extentions like avg toolbar. But in safe mode, these are all turned off? it still crashes in safe mode?

crashes in normal mode with all addons/ extentions off. crashes in safe mode. just for browsing it works ok, in both modes.

if I want to apdate a plugin it crashes also. i.e. goto Mozilla plugin check page. ok

then click on a plugin to update, bang!!

the two reports below, one in safe mode, one in normal mode(addons etc all off)

https://crash-stats.mozilla.com/report/index/bp-9e7dac39-91c5-425c-9855-153352140520

https://crash-stats.mozilla.com/report/index/bp-95e77989-6bc2-4fcb-a5b4-dce702140520

Any more Ideas?

reset FF, no fix deleted preferences, no fix

Looks like I have fixed it.

Uninstalled Mozilla FF 29. clicked the delete all Mozilla data. did do a backup of bookmarks. before uninstall.

Reinstalled. seems ok