To test out of process extensions, go to about:config and set extensions.webextensions.remote to true. Note: after flipping this pref it shouldn't require a restart, but it might not run reliably without one, so just restart Firefox ok?
APIs that are particularly affected by out of process:
For more information see this etherpad
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4