I've been staying with Firefox not for the performance (today Chrome loads Google sites like YouTube faster), but mainly for Tree Style Tab extension. I couldn't imagine opening more than a dozen of tabs without it.
I can't imagine having more than a dozen tabs open, period. You tab hoarders will never make sense to me...
Firefox/Sideberry is useful for mitigating that. I also have workflows set up for mass-exporting my tabs from Firefox to a text file and reorganizing them in plain-text and re-opening just the tabs I care about[0].
Bookmarking on any browser is cumbersome and leads to disorganization over time. Tree-style tabs helps make that organization at least a little bit easier.
If you use the word "just" then it's a you issue. Close the tabs and you'll be happier.