I use LibreWolf (a rebranded Firefox clone with less tracking) with TST and just recently I exported a few hundred tabs I didn't care for anymore so now I am down to 2-300 tabs.
I don't think it is as lean as some versions of old Firefox, but I have no problems with 500 - 1000 tabs (and I often run it next to a full IDE + VSCode + Firefox ++).
I don't think it is as lean as some versions of old Firefox, but I have no problems with 500 - 1000 tabs (and I often run it next to a full IDE + VSCode + Firefox ++).