I have used this method for years and it has not changed at all in that time period. I put all my bookmarks in one folder, no hierarchy, and add the tags that is on the top of my head, and move on. I save new bookmarks several times a day and retrieve them within seconds. For me, it is a perfect system and has not changed at all while I have used it. And believe me, I have tried a lot of bookmarking solutions the last 20 years, nothing has stuck like this basic habit has.

I'm have been using the latest version of FF for about 14 years, first 10 years on Arch Linux, and the last 4 years on Fedora (the Flatpak version).