Форум спільноти Firefox

A pop-up suggested that I use profiles to organize and it sounded like a great idea but then after making profile I was having trouble getting tabs from one page to another. Then I discovered that I had to log in my accounts onto every profile I made and it sounded like a terrible idea, so I tried deleting all my profiles to get it to revert but now that I open the browser it shows me to make a new Profile. So, I want to know how can I revert back to using Firefox Without the use of profiles like I was before clicking the pop-up

FF 148.0, Intel Mac, current 15.7.4 (Sequoia)

In the middle of a browsing session I needed to consult my substantial browsing history and found it to be gone. I quit FF using the dropdown and restarted. After restarting FF the browsing history showed only that session and the TST sidebar with many tabs didn't display so I concluded FF created a new profile for startup but using my home page. I have the profile in use at the time (profile_a) and a month old backup of it. profile_a seems to have all the expected data and the bookmarks are correct. I've hacked around within Profile Groups and profiles.ini but FF refuses to use profile_a in spite of my edits, and worse is silent about it so I'm stuck and need help.

Possible related issue: is TST sensitive to the number of tabs? I'm a hoarder and find TST easier to use than bookmarks so had about 700 tabs stashed in TST.

New OS LMDE7 (trixie debian 13 base) Installed Firefox from the Mozilla Firefox Debian Package mozilla-debian- 1.0 Firefox 148.0

I've just installed LMDE7 alongside LMDE6 and want to move the 6 profile into 7. I've exported the 6 profile into backup and then moved it into the new Firefox Home folder (\home\...\.config\mozilla\firefox) Found both profile.in and installs.ini there AND many different profiles. (I had tried to use the profile manager and seem to have created lots of profiles beside the default-release from 7. Installs.ini shows both the original profile from the 7 install and one created with the Profile Manager and both are locked. They are also in profile.ini as installed.

So my Question is how do I install the old profile into profile.ini?