Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Firefox can't find javascript files on localhost

  • 2 replies
  • 34 have this problem
  • 1 view
  • Last reply by Arfon Parry

Arfon Parry
Arfon Parry
more options

I'm running firefox 21.0 on windows 8. I've installed Apache 2.4 (64 bit) as a web server on localhost.

I'm getting sporadic unexpected results testing my web pages. When I look at the source code (Ctrl-U) and click on the link to the javaScript files, for some of the files I get the firefox warning page (with exclamation mark in yellow triangle - not the 404 message) claiming that firefox cannot find the javaScript file. The files do exist and capitalization is correct.

The links are coded like this: <script type="text/javascript" src="/cradur/JSLib/dataGrid.js" charset="utf-8"></script> The web page is xhtml1-strict.

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.

I'm running firefox 21.0 on windows 8. I've installed Apache 2.4 (64 bit) as a web server on localhost. I'm getting sporadic unexpected results testing my web pages. When I look at the source code (Ctrl-U) and click on the link to the javaScript files, for some of the files I get the firefox warning page (with exclamation mark in yellow triangle - not the 404 message) claiming that firefox cannot find the javaScript file. The files do exist and capitalization is correct. The links are coded like this: <script type="text/javascript" src="/cradur/JSLib/dataGrid.js" charset="utf-8"></script> The web page is xhtml1-strict. 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.

All Replies (2)

jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 10 Contributor
more options

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?

Arfon Parry
Arfon Parry Question owner
more options

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.