Bug 697319 landing broke several extensions. Confirmed are MEGA EXTENSION , GMail Manager  and Browser Backgrounds . When these extensions are enabled, it becomes impossible to open or close new tabs (and the error console), making the browser essentially unusable. I'm told that this is the result of bad programming in the extensions and that they could be easily fixed , though. STR: 1) From a fresh profile, install any of the listed extensions. 2) Restart the browser, and notice that only a single tab is opened. Pressing the new tab button doesn't visibly do anything. 3) Try to close the browser - it will warn about closing multiple tabs.  https://addons.mozilla.org/en-US/firefox/addon/meganz/  https://addons.mozilla.org/en-US/firefox/addon/gmail-manager/  https://addons.mozilla.org/en-US/firefox/addon/browser-backgrounds/  http://forums.mozillazine.org/viewtopic.php?p=12826625#p12826625
Confirmed here, disabling the Mega extension fixed it.
Status: UNCONFIRMED → NEW
Ever confirmed: true
Bug 697319 was backed out due to this problem. Thanks for reporting it http://hg.mozilla.org/integration/mozilla-inbound/rev/3b3d66182d26
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