[Greasemonkey] install bar on 404 response

[carlos campderrós]

Hi!

I mistyped the url address of a userscript and I got both firefox showing a
404 error and the greasemonkey "this is a gm userscript! install it!" bar.
Try this: http://greasemonkey.mozdev.org/hey_ma_I_found_a_little_bug.user.js

Using firefox 1.5.0.5/Ubuntu linux, GM 0.6.5.20060727

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