Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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.
Solved Archived

Profile doesn't load when I downgrade from Quantum

Firefox Installation and updates
guigs replied 8 years ago
jkmaps12
jkmaps12

I've tried out Quantum and decided I didn't like it (it didn't support most of the addons that I use frequently and there wasn't a noticeable speed boost) so I tried to roll back to a pre-Quantum version (ver 47) but when I did, the newly loaded FF was a clean slate; all the addons, bookmarks, and open tabs were gone. They only came back when I re-installed FF Quantum. I still want to use a pre-Quantum Firefox. How do I do this?

I've tried out Quantum and decided I didn't like it (it didn't support most of the addons that I use frequently and there wasn't a noticeable speed boost) so I tried to roll back to a pre-Quantum version (ver 47) but when I did, the newly loaded FF was a clean slate; all the addons, bookmarks, and open tabs were gone. They only came back when I re-installed FF Quantum. I still want to use a pre-Quantum Firefox. How do I do this?

All Replies (1)

guigs
guigs

Chosen Solution

Firefox does not support downgrades. And I don't recommend doing this with any release profile.

These are the risks https://support.mozilla.org/en-US/kb/risks-downgrading-older-version-shar...

I am sorry we could not be more helpful to your question.

Are there particular features that you need help changing that would prevent a downgrade?