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

Wannan tattunawa ta zama daɗaɗɗiya. Yi sabuwar tambaya idan ka na bukatar taimako.

Getting error FF with my extension: cant find the file at jar:file in omni.jar!/chrome/browser/content/browser/<some junk text>

  • 1 amsa
  • 4 sa na da wannan matsala
  • 17 views
  • Amsa ta ƙarshe daga cor-el

more options

After installing my plugins to ff4 and ff5 I am getting error File not found.

Firefox can't find the file at jar:file:///Applications/Firefox.app/Contents/MacOS/omni.jar!/chrome/browser/content/browser/%E6%A5%A6%E6%95%AC%E2%BC%BA%E2%BC%AF%E7%8D%95%E7%89%A5%E2%BD%B3%E6%B5%A1%E6%B1%AF%E4%B0%AF%E6%89%A9%E6%85%B2%E7%A5%B2%E4%84%AF%E7%81%B0%E6%A5%AC%E6%85%A3%E6%A5%B4%E6%B9%AF%E3%88%A5%E5%8C%B0%E7%81%B5%E6%BD%B0%E7%91%B2%E4%84%AF%E6%BD%A4%E6%95%A2%E4%8C%AF%E6%B9%AF%E7%89%B4%E6%89%A9%E7%91%B5%E2%95%A5%E3%80%B2%E5%8D%83%E2%B8%B5%E2%BC%B1%E6%BD%83%E6%99%AE%E6%9D%A9%E7%89%B5%E7%91%A1%E6%BD%A9%E2%BD%AE%E4%89%89%E5%91%85%E6%B5%A5%E2%BD%B0%E6%BD%83%E7%91%AE%E6%A5%B2%E7%95%A2%E6%95%B4%E3%84%B6%E3%9C%B8%E3%90%B4%E2%B8%B3%E6%89%A9e%E3%90%B4%E2%B8%B3%E6%89%A9e%08%01%EC%92%B0%E0%B0%BE%EC%92%B8%E0%B0%BE%EC%92%BC%E0%B0%BE%EF%BF%BF%EC%93%80%E0%B0%BE.

After installing my plugins to ff4 and ff5 I am getting error File not found. Firefox can't find the file at jar:file:///Applications/Firefox.app/Contents/MacOS/omni.jar!/chrome/browser/content/browser/%E6%A5%A6%E6%95%AC%E2%BC%BA%E2%BC%AF%E7%8D%95%E7%89%A5%E2%BD%B3%E6%B5%A1%E6%B1%AF%E4%B0%AF%E6%89%A9%E6%85%B2%E7%A5%B2%E4%84%AF%E7%81%B0%E6%A5%AC%E6%85%A3%E6%A5%B4%E6%B9%AF%E3%88%A5%E5%8C%B0%E7%81%B5%E6%BD%B0%E7%91%B2%E4%84%AF%E6%BD%A4%E6%95%A2%E4%8C%AF%E6%B9%AF%E7%89%B4%E6%89%A9%E7%91%B5%E2%95%A5%E3%80%B2%E5%8D%83%E2%B8%B5%E2%BC%B1%E6%BD%83%E6%99%AE%E6%9D%A9%E7%89%B5%E7%91%A1%E6%BD%A9%E2%BD%AE%E4%89%89%E5%91%85%E6%B5%A5%E2%BD%B0%E6%BD%83%E7%91%AE%E6%A5%B2%E7%95%A2%E6%95%B4%E3%84%B6%E3%9C%B8%E3%90%B4%E2%B8%B3%E6%89%A9e%E3%90%B4%E2%B8%B3%E6%89%A9e%08%01%EC%92%B0%E0%B0%BE%EC%92%B8%E0%B0%BE%EC%92%BC%E0%B0%BE%EF%BF%BF%EC%93%80%E0%B0%BE.

All Replies (1)

more options

Try:

"Reset all user preferences to Firefox defaults" on the Safe mode start window.


Delete the files extensions.* (extensions.sqlite, extensions.rdf, extensions.cache, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
New files will be created when required.

See "Corrupt extension files":

If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to do a compatibility check or see if there is an update.


Create a new profile as a test to check if your current profile is causing the problems.

See:

If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files)

See: