1641929 - Disable Fission when Firefox is started in Safe Mode

Status: RESOLVED FIXED

(Core :: DOM: Content Processes, enhancement, P3)

Description

[Chris Peterson [:cpeterson]]

We always enable Fission if the fission.autostart pref is true, even in Safe Mode. If a user is running into Fission stability problems, they won't be able to start Firefox to disable the fission.autostart pref if we enable Fission in Safe Mode.

We should probably fix this bug for Fission M6a because early dogfood testers are the users most likely to hit Fission stability issues.

Comment 1

[u608768]

Attachment: Bug 1641929 - Add a fission.autostart getter, r?nika

This makes it easier to consider special conditions when checking the pref. It
currently returns false if safe mode is enabled.

Comment 2

[u608768]

Attachment: Bug 1641929 - Replace uses of StaticPrefs::fission_autostart() with FissionAutostart(), r?nika

Depends on D78798

Comment 3

[u608768]

Attachment: Bug 1641929 - Prevent fission.autostart from changing at runtime and mark it as do_not_use_directly, r?nika

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/746a612cdaa0
Add a fission.autostart getter, r=nika
https://hg.mozilla.org/integration/autoland/rev/15b66aaa0226
Replace uses of StaticPrefs::fission_autostart() with FissionAutostart(), r=nika
https://hg.mozilla.org/integration/autoland/rev/17a0438d49cc
Prevent fission.autostart from changing at runtime and mark it as do_not_use_directly, r=nika

Comment 5

[Andreea Pavel [:apavel]]

https://hg.mozilla.org/mozilla-central/rev/746a612cdaa0
https://hg.mozilla.org/mozilla-central/rev/15b66aaa0226
https://hg.mozilla.org/mozilla-central/rev/17a0438d49cc