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by nsm 3232 days ago
For those who don't notice the speed, multiprocess may be disabled due to certain addons. Go to about:support to check if it enabled. The addon compatibility checker addon can tell you which are the offending addons. For me 1password was the big blocker, but they recently released a beta that works with the new API. Sorry for the lack of links, I'm on mobile.
1 comments

Oh interesting. Firefox still seems slow and a bit of a memory hog compared to Chrome on my machine. Sure enough I checked and three add-ons are marked as legacy (and presumably disabled the multiprocess stuff): uBlock Origin, Websocket Disabler, and NoScript.
At least uBlock Origin is compatible with multi-processes. I'm using it right now.

Firefox 55 marks classic extensions as legacy, this has nothing to do with multi-process comparability.

Yep, not legacy, but "not compatible with multiprocess" is what it should show for offending addons.
Well, how can one determine which addons are multi-process compatible?