As Firefox is by far my most used app, I find that bookmarking the current tab and describing the task with no more than a few words or even as little as a few chars, to be a good way to keep track of what things I need to do soon. For things I would get to later or whenever I feel like it, I’ll put them in Firefox’s “Boookmarks Menu” or “Other Bookmarks” folders, and have lots of folders consisting of Reddit posts and searches about different topics.
to me op has 6 downvotes. maybe look at your settings, i remember after an update i had to turn downvotes back on
edit: (forgot to say it before) i also use them like that, the first ones being things i visit often (but not often enough to remember the link easily), which i leave in specific folders, and the rest is to-do stuff or the same as the other thing but more important