Firefox crashes for a variety of reasons, but you can quickly fix most crashes with It’s Reset feature.
Resetting Firefox
Firefox stores all your data in a profile folder. Problems can occur with the folder.Reset feature will create a new profile folder and will migrate all your bookmarks, browser history, saved passwords,etc
upon resetting you will lose all your extensions, themes, search engines,etc.
Steps to be followed
1.Open Firefox and go to Help>Troubleshooting Information

2.You'll see "Reset Firefox button" , just click on that

Now Firefox will create a new profile for you and migrate most of your old information over.The new, clean profile should fix your crashes
via- howtogeek
Resetting Firefox
Firefox stores all your data in a profile folder. Problems can occur with the folder.Reset feature will create a new profile folder and will migrate all your bookmarks, browser history, saved passwords,etc
upon resetting you will lose all your extensions, themes, search engines,etc.
Steps to be followed
1.Open Firefox and go to Help>Troubleshooting Information

2.You'll see "Reset Firefox button" , just click on that

Now Firefox will create a new profile for you and migrate most of your old information over.The new, clean profile should fix your crashes
via- howtogeek
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Firefox