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Re:Firefox 54: E10S-Multi, WebExtension APIs, CSS Clip-Path by locusm on Wednesday June 14, 2017 @03:23AM (#14551190)
"As part of the roll-out, e10s-multi is only enabled for 80% of the Release population, so we can make sure we didn’t introduce new crashes."

You can check in about:support

Re:Firefox 54: E10S-Multi, WebExtension APIs, CSS Clip-Path by okket on Wednesday June 14, 2017 @06:02AM (#14551655)
If you have any add-on installed you will probably read there:

  Multiprocess Windows 	0/1 (Disabled by add-ons)
Re:Firefox 54: E10S-Multi, WebExtension APIs, CSS Clip-Path by majewsky on Wednesday June 14, 2017 @08:20AM (#14552171)
I have five addons installed (uMatrix, Decentraleyes, vimFx, etc.), and none of them block multiprocess. If you read something like this in your about:support, you better start shopping for multiprocess-compatible alternatives (e.g. I replaced Vimperator with vimFx because Vimperator's architecture and scope is fundamentally incompatible with multiprocess from what I've heard).