@d3rik in terms of missing tabs, sometimes it can be reclaimed by using the commands to Reopen closed tab, which on Windows is Ctrl+Shift+T. You may have to continually keep hitting it until everything is open, but there’s obviously limits to this. Unfortunately, crashes tend to clear out cache. This means that information may not be able to be recovered.
In terms of History ending just 3 months back, that’s because that is the limit. This has been a thing for a while. This is essentially true for Chrome as well, as can see in their response to someone having an issue at https://support.google.com/chrome/thread/146805323?hl=en&msgid=146841055
And you can see conversation from a year ago or so regarding Brave: https://www.reddit.com/r/brave_browser/comments/15dd27p/chromium_90day_delete_has_ruined_10_years_worth/ and Longer browsing history than the 3 month default
Just to be clear, you know you can type words to search through History and don’t need to just scroll through it all, right?