For me, it seems like contentStyleFile: data.url('mod.css') is causing the exception.
I have the same issue (and also did not in Fennec 33). Removing the content style file "solved" it for me as well.
Looks like this line of code is the culprit: > tab.QueryInterface(Ci.nsIBrowserTab) === tab;
This bug seems to be causing the following issue: https://github.com/kevincox/youtube-e2l/issues/10
This bug is causing the following issue as well: https://github.com/pratikabu/scrolltotop/issues/35
Does still reproduce on Firefox 40? Because bug 1167764 which is similar doesn't anymore.
Status: NEW → RESOLVED
Last Resolved: a year ago
Resolution: --- → INCOMPLETE
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