You are providing some info now. 
There could a lot of reasons. Wrong plug-in in Firefox can freeze Firefox but system freeze cause of that is rare.
Lets check if Mozilla is the real culprit.
Backup bookmarks of Browser. Rename .mozilla folder to .mozilla.bak in your /home/user_id folder. Browser will create new .mozilla folder. It won't show any bookmarks or installed extensions/Add-ons. Code: cd ~
mv .mozilla .mozilla.bak
Launch mozilla browser. Check if system freeze up again.
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