It's hard to tell, but this looks like the Microsoft office plugins are crashing Firefox. Some of your other plugins are out of date, which could be adding to the issues. See https://www.mozilla.org/en-US/plugincheck/ to update your plugins. You'll want to try removing (or renaming) the MS Office plugin files to fix this issue. First, type about:plugins in your URL bar and hit 'Enter.' On that page, find the two plugins called: "The plug-in allows you to open and edit files using Microsoft Office applications" AND "Office Authorization plug-in for NPAPI browsers" Look for the "path" sections for those plugins- they should look something like: "Path: C:\Program Files\Microsoft\Office\internet\example.dll" Then find those two dll files (one for each plugin) on your computer. Next, close firefox and then rename the .dll files from example.dll to example.dll.bak. Now, restart Firefox- the plugins should not load and you should not have this crashing issue.