[sebtoast]

I use it the same way but it was bugging me so I installed an add-on called TooManyTabs and you can set a limit to the amount of tabs you can have opened.

I also reserve some time to clean them up about once a week, I start with the oldest tab and "take care of it", sometimes it's just a news story I want to read, sometimes it's something I kept opened because of the information on that page.

If I don't do that I will have a thousand tabs opened and will never actually do anything about it.