On my 2017 Ultrabook with only 4gb of ram, Firefox stalls repeatedly & has long stretches of being entirely unresponsive after half a dozen tabs, and gets worse

On my 2017 Ultrabook with only 4gb of ram, Firefox stalls repeatedly & has long stretches of being entirely unresponsive after half a dozen tabs, and gets worse from there. I have some delay where a navigation might be delayed some, but Chrome doesn't ever lose input and generally manages to keep going. Even on a desktop with 64GB ram, Firefox gets slow over time & needs to be restarted when I have a significant number of tabs open. Tab auto-suspend extensions generally "fix" the problem, but it's been frustrating that whatever the on-page performance is in Firefox, the app itself feels so prone to bouts of unresponsiveness.