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.

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 shrinks to smallest size possible when starting and shows error about a massing jar:file when expanded

  • 1 reply
  • 1 has this problem
  • 1 view
  • Last reply by Standard8

Daniel Meskin
Daniel Meskin
more options

When expanded, the full error message is: "File not found

Firefox can’t find the file at jar:file:///C:/Program Files/Mozilla Firefox/browser/omni.ja!/chrome/browser/content/browser/browser.xul."

When expanded, the full error message is: "File not found Firefox can’t find the file at jar:file:///C:/Program Files/Mozilla Firefox/browser/omni.ja!/chrome/browser/content/browser/browser.xul."

All Replies (1)

Standard8
Standard8
more options

This sounds like something in the installation has become corrupt. You probably want to try re-installing Firefox and see if that helps.