Mozilla seems to be transitioning to becoming an advertising company so I wouldn’t want them to have my data either.

pretty sure if you don’t visit a tab for a while or reopen your browser with the “keep previous tabs” setting thingy on, those tabs are not all loaded in memory. even if I have 100 tabs open, most of them take up negligible space in ram and only load in once I click on it. also I’m lazy and creating/deleting bookmarks is more work than closing/opening tabs.