That files is responsible for drawing the tab bar and tab panels. *view-source:chrome://global/content/bindings/tabbox.xml ---- If you have submitted crash reports then please post the IDs of one or more recent crash reports that start with "bp-". *bp-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx You can find the report ID of recent crash reports "on the "Help -> Troubleshooting Information" (about:support) page". *click the "All Crash Reports" button on this page to open the <b>about:crashes</b> page and see all crash reports. Alternatively you can open about:crashes via the location/address bar. See also: *http://kb.mozillazine.org/Mozilla_Crash_Reporter *https://support.mozilla.org/en-US/kb/Mozilla+Crash+Reporter