I dug around and found a fix for the "constantly eats all my CPU" issue: Turn on "compact" tab layout.
Which then creates the problem that now I'm using the "compact" tab layout that everyone in the betas screamed bloody murder about until they added that switch, god this layout is really annoying if you have any extensions up in the toolbar and/or more than about four tabs. But at least I don't have to deal with using fucking Chrome or losing all my text expansion shortcuts because Firefox refuses to support those.
My inner paranoid wonders if this is a deliberate tactic to boost the numbers of people using the "compact" layout by someone whose next performance review is riding on that layout: "see, boss, look at what the telemetry says - everyone's switching to Compact! We should just drop the old look and give me a major bonus!".
Which then creates the problem that now I'm using the "compact" tab layout that everyone in the betas screamed bloody murder about until they added that switch, god this layout is really annoying if you have any extensions up in the toolbar and/or more than about four tabs. But at least I don't have to deal with using fucking Chrome or losing all my text expansion shortcuts because Firefox refuses to support those.
My inner paranoid wonders if this is a deliberate tactic to boost the numbers of people using the "compact" layout by someone whose next performance review is riding on that layout: "see, boss, look at what the telemetry says - everyone's switching to Compact! We should just drop the old look and give me a major bonus!".