Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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

I want to restore to a previous version.

  • 1 reply
  • 11 have this problem
  • 1 view
  • Last reply by philipp

more options

i let Firefox migrate my v18.0.2 to v19. I want to restore to v18 because PDF access is too slow on v19. I don't know where to find v18 to install it again. By letting Firefox do migrations, I never actually download and save the versions. I have no idea where Firefox is saving them on my system.

i let Firefox migrate my v18.0.2 to v19. I want to restore to v18 because PDF access is too slow on v19. I don't know where to find v18 to install it again. By letting Firefox do migrations, I never actually download and save the versions. I have no idea where Firefox is saving them on my system.

All Replies (1)

more options

hello, firefox 19 has introduced its own integrated pdf viewer - if you want to switch back to the plugin you've used before to view pdfs just go to firefox options > applications & define the default action for the portable document format (pdf).

View PDF files using Firefox’s built-in viewer