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Force "multiprocess mode" in FF 52

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On 5/18/2019 at 5:21 AM, DrWho3000 said:

What does browser.tabs.remote.force-enabled do

Very first post:

On 5/7/2019 at 4:53 PM, Mathwiz said:

You can force "multiprocess mode" in FF 52 by creating the Boolean preference browser.tabs.remote.force-enable and setting it to true. (Also works in Serpent, BTW.)

This splits FF (or Serpent) into two processes.


On 5/18/2019 at 8:17 AM, Dave-H said:

browser.tabs.remote.autostart.2 (may not be present)

These prefs don't really matter when running FF 52.9 on WinXP, since it's been coded to block e10s on XP unless browser.tabs.remote.force-enable is set to true - in which case e10s is enabled irrespective of these other prefs.

These prefs do matter on later Windows versions (and are the preferred method of enabling e10s) but let's stick with FF 52.9 on XP for now.

On 5/18/2019 at 8:17 AM, Dave-H said:


Once e10s is enabled, this controls how many additional processes you can have. There's one "core" process plus one process per open tab up to the limit set by this pref.

Personally, I set dom.ipc.processCount to 2. The default of 1 gives me little benefit, but larger values just waste RAM while providing little additional benefit, at least in my experience. But as usual, YMMV.

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