The crash report shows an older beta version: 41.0b99 (Release Channel: beta) Make sure to update that version to the official release or install the full version of the release to switch to the Release update channel.

You can find the full version of the current Firefox release (41.0) in all languages and all operating systems here:

• https://www.mozilla.org/en-US/firefox/all/

If that still crashes then try to update to the next 42 beta later this week.

thanks @cor-el for your reply i will do it and see what happens next

unfortunately this seems to be a reproducible crash with the "Mozilla Archive Format, with MHT and Faithful Save" extension and firefox versions higher than 41. i've filed a bug for it - you could follow along for any progress there...

I`ve updated firefox 41 to ver 42 beta1 but it still crashes and now when i am trying to open a .maff file, plugincontainer.exe also stop responding.Only webpages that i`ve saved from wikipedia with maf opens.With this 42 update my crash id is 1c990fe9-e9ce-4d61-be7c-5b7e2effecde

hi again, both firefox 42 beta & 41 release got an update now which should fix this crash. in order to get the latest version go to the firefox menu ≡ > help ? > about firefox which will trigger a search for updates...