This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

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

error message The following extension(s) are required by Page Speed and must be installed before it can run: - Firebug (http://getfirebug.com/)

  • 5 replies
  • 358 have this problem
  • 1 view
  • Paskiausią atsakymą parašė pablo.panadero

more options

I am building a website with Rage software. When I open the page in the sites folder on my computer (Mac OSX 10.6.8) to view a page as it would appear on the Internet it won't open in firefox. I get an error message: Java Script application The following extension(s) are required by Page Speed

and must be installed before it can run:

- Firebug (http://getfirebug.com/) I went to getfirebug.com but can't find any programs for java script.

I am building a website with Rage software. When I open the page in the sites folder on my computer (Mac OSX 10.6.8) to view a page as it would appear on the Internet it won't open in firefox. I get an error message: Java Script application The following extension(s) are required by Page Speed and must be installed before it can run: - Firebug (http://getfirebug.com/) I went to getfirebug.com but can't find any programs for java script.

All Replies (5)

more options
more options

Thank you for the link. I clicked to download it, message came up, not compatible with Fire Fox 5. Do you happen to know how I can get the pop up to naff off. I have pop up turned off on my computer already. Thanks.

more options

Hi stressmatters, I had the same problem, but when I click on the last file in the list (firebug-1.7.3.xpi) it worked


Try you too maybe you can resolve your problem.

more options

Thank you for the suggestion. I solved this problem by deleting and reinstalling Fire Fox. I am not sure which one I was running, but doing this stopped the pop up. I use Safari more than Firefox, so I am not too bothered about having the latest updates. I do believe this happened when I updated prior to deleting and reinstalling.

more options

Instead of uninstalling and re-installing firefox, just go to Tool/add-ons, then disable and/or delete PageSpeed (under extensions).