I'm running firefox 21.0 on windows 8. I've installed Apache 2.4 (64 bit) as a web server on localhost.
IMPORTANT: THIS ERROR IS ONLY OCCURRING SPORADICALLY. The web page (and JS file) will work fine for a time, then suddenly firefox will no longer be able to find the file.
Please note also that the current set up is on a new laptop, which I've only been using for a week. I've previously run firefox/ajax on windows XP for years without encountering this problem.
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Do you use a port number in your localhost URLs? If so, have you noticed any changes to (or omission of) those numbers as you test the application?
Although I don't think you can do a reload bypassing cache (Ctrl+Shift+r) in the source viewer, if you do that in a page that wasn't able to load the script, does that help?
Thanks for yor reply.
No, I don't use a port number in the localhost URL.
Yes a 'reload bypassing cache' (ctrl+shift+r) on the 'warning' window does find the JS source, and the application subsequently runs.
This doesn't explain why Firefox can't find the JS file initially - and will make testing a bit of a minefield.