Hmm....
I'm in the process of figuring out with alert statements where the
error is (restarting did nothing) but there's a peculiarity: sometimes
the site i'm using this on displays a CAPTCHA instead of the normal
page (which is perfectly fine: i'm not trying to automate anything and
I don't violate their TOS, but other greasemonkey scripts would try
and "play for you"). The script works on these pages, most likely
because it simply try{}s and fails somewhere down the line.

I'll let you know how my alert tracing goes.

On 11 Jan, 00:45, RodMcguire <[email protected]> wrote:
> Since I'm not on face book I can't test your script, but I did look
> briefly at it.
>
> 1) I didn't see the script peppered with alerts so you can tell how
> far it gets before crashing FF.
>  Surely if you put "alert('starting')" at the top of script that will
> do something.
>
> 2)  Have you run Windows Task Manager (or whatever it is called in W7)
> to see if FF is rapidly eating up and running out of memory? That can
> cause unexplained crashes..
>
> 3) Have you tried rebooting? Sometimes XP/Vista/W7 gets screwed up
> such that FF behaves badly even after reloading but works fine after a
> reboot.
>
> On Jan 10, 7:09 pm, Gigitrix <[email protected]> wrote:
>
>
>
> > Hi there, I'm essentially reporting what *may* be a bug at this point.
> > I'm working on my first userscript (I'm predominantly PHP/MySQL, and
> > hate javascript with a passion but it must be done ;) ) And it seems
> > that everytime my script runs on a particular page, firefox
> > immediately crashes.
>
> > Here is my 
> > script.http://userscripts.org/scripts/version/64902/162079.user.js
>
> > The script runs fine on any page of Mythmonger (http://
> > apps.facebook.com/mythmonger/*), even on the 
> > pagehttp://apps.facebook.com/mythmonger/turn.php, but as soon as it 
> > hitshttp://apps.facebook.com/mythmonger/archive.phpthepage appears to
> > physically load, then firefox crashes. None of the visible effects
> > from my script (e.g. alert() statements) are visible.
>
> > I get that there are probably errors in my code: that's not the
> > problem here. The issue I have is that the errors shouldn't be able to
> > bring down ff: even infinite loops are caught by the browser itself,
> > and I would at least see SOMETHING going on there... Clearly
> > greasemonkey "denial of service" attacks aren't viable, but it's not a
> > good thing...
>
> > I can't check the error console as there is no way to get to it (FF
> > completely locks up and must be force-quit) but I tried disabling all
> > extensions and the result still stands. If I turn greasemonkey off
> > (grey monkey) it loads absolutely fine. Other greasemonkey scripts, as
> > well as this one on other pages, have worked like a charm.
>
> > To summarise, using the script seen above and visiting archive.php of
> > that facebook app, firefox crashes to desktop. I wish I could provide
> > a simpler test case but javascript really isn't my area and i've
> > stumbled across this while trying to develop my application. I am very
> > willing to provide additional details as I would love to find out
> > what's at the root of this problem.
>
> > --Toby Pinder
>
> > Environment Details:
>
> > Windows 7 Professional
> > Firefox 3.5.7
> > Greasemonkey 0.8.20091209.4
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