@78057016635d@mastodon.social @ruffni@mstdn.io

For me, when I select Firefox Settings --> Privacy and Security --> Clear History...
then that gives a window that looks like this.

Note that to clear everything, you have to:
- select "Everything" in time range, instead of the default which is to only clear the last hour.
- check all the seven check boxes, only one of them is checked by default.

I think that if you do all that then it will actually clear everything, but it's easy to miss something there.