Comment by philsnow
Firefox is particularly good at having lots of tabs open and not using tons of memory.
$ ~/dev/mozlz4-tool/target/release/mozlz4-tool \
"$(find ~/Library/Application\ Support/Firefox/Profiles/ -name recovery.jsonlz4 | head -1)" | \
jq -r '[.windows[].tabs | length] | add'
5524
Activity monitor claims firefox is using 3.1GB of ram. Real memory size: 2.43 GB
Virtual memory size: 408.30 GB
Shared memory size: 746.5 MB
Private memory size: 377.3 MB
That said, I wholeheartedly agree that "more RAM less problems". The only case I can think of when it's not strictly better to have more is during hibernation (cf sleep) when the system has to write 128GB of ram to disk.
In my experience firefox is "pretty good" about having lots of tabs and windows open if you don't mind it crashing every week or two.