[solved: zotero problem] Firefox: "uri.host is explosive!"

I have an issue in Firefox (probably since the update to 26.0). I am using Mozilla's 64 bit build with a Welsh language interface.
When I navigate to certain sites, Firefox shows me the loading... forever. If I click on another firefox window or tab, it is entirely blank grey - no tabs, no tool or status bar, no menus, no nothing. If I return to the original tab or window, it is now also blank. The only thing I can do is kill the programme. The links which cause these errors seem to all involve javascript but not all javascript triggers the problem.
Looking in ~/.xsession-errors, I see that I get
uri.host is explosive!
(about:blank)
Could not check applicable rules for about:blank
This is preceded by a javascript error which varies according to the particular site. I can post examples if that would be helpful - right now I'm picking out what is common to all the cases.
Searching for this error, I found a couple of things but they don't seem generally applicable to my case. An opensuse thread concerned somebody who saw the problem in all browsers but I don't see the issue in chromium. Moreover, that thread concerned mismatching packages and left-over remnants of outdated packages and I'm 99% positive that doesn't apply in my case. An Ubuntu thread here suggests that the explosive error indicates a malicious site. However, I'm sure these sites are not malicious unless University of Chicago Press and JSTOR have moved over to the Dark Side. Also, that thread included no followup or resolution so isn't much help. And that's it. Only two results. Varying the terms a little, I got a third result in a language I can't understand but which looked like a translation of the Ubuntu one.
Does anybody have any immediate ideas before I start pulling Firefox apart, which is next on my list of troubleshooting steps? In particular, what does the explosive error indicate and what rules does it want for about:blank?
Last edited by cfr (2013-12-15 00:10:48)

alphaniner wrote:Did you see this and/or this?
No, I didn't. Thank you (and I wonder why my search didn't find it since that string is certainly included in those pages!).
So that's probably not why I get the problem. Oh, well, back to bug hunting.
EDIT: Damn. Now I'm home, I can't reproduce the problem. The difference is I'm now authenticating to access the site I tested but that seems more precarious than otherwise. No idea...
Last edited by cfr (2013-12-13 23:22:55)

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