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.

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.

How can I downgrade Firefox 65 back to 64?

  • 2 replies
  • 1 has this problem
  • 34 views
  • Last reply by FredMcD

kbrunsting
kbrunsting
more options

After installing 65 on one of my systems, I noticed a number of user interface elements that didn't look right and for some reason my addon's page just showed blank rectangles where my addons would be, so I thought I'd downgrade to 64. I installed 64 and it seemed successful, but it asked to reboot at the end, which doesn't always happen with upgrades.. but I rebooted and when the system came back up, nothing happened, and my prior Firefox link didn't work anymore. I tried reinstalling 64 again but it said something like the installation was in progress and wanted to reboot again, but again nothing happened. I had to select a new directory for the installation to get it to work.

I thought maybe it was a fluke, so I tried it on another system... and same thing. So is there something unique about version 65 that is making the downgrade fail? What's the right way to downgrade this version?

After installing 65 on one of my systems, I noticed a number of user interface elements that didn't look right and for some reason my addon's page just showed blank rectangles where my addons would be, so I thought I'd downgrade to 64. I installed 64 and it seemed successful, but it asked to reboot at the end, which doesn't always happen with upgrades.. but I rebooted and when the system came back up, nothing happened, and my prior Firefox link didn't work anymore. I tried reinstalling 64 again but it said something like the installation was in progress and wanted to reboot again, but again nothing happened. I had to select a new directory for the installation to get it to work. I thought maybe it was a fluke, so I tried it on another system... and same thing. So is there something unique about version 65 that is making the downgrade fail? What's the right way to downgrade this version?

All Replies (2)

FredMcD
FredMcD
more options

Note: Some versions of Quantum change how the data files are set up, so they are not backward compatible.

FredMcD
FredMcD
more options

Is the newly installed program working? If so, I would advise that you open the Programs Folder on the computer and remove the old program.