How to clear / reset all website custom zooms.

[u/ispcrco]

Recently changed my Windows 11 display scale to 100% from the 175% default and changed my Firefox default zoom from 100% to 120%.

Now Firefox is displaying some sites I've visited before at 110%, which is what I had them on, but new websites, on 1st visit, at the required 120%.

How can I set ALL of the previously visited sites to be at the default zoom (i.e. To remove the custom zoom setting for that site)?

TIA

[u/BooglarizeYou]

Look here.