1527081 - Don't create preloaded "new tab" browsers purely based on session restore creating new tabs for every window

Status: RESOLVED FIXED

(Firefox :: Tabbed Browser, enhancement, P1)

Description

[:Gijs (he/him)]

Our preload browser creation seems like it could be improved.

Specifically, it currently creates preload tabs when a new tab finishes opening. There are two immediately-obvious downsides here:

1. the first new tab opened on non-session-restored sessions (which is most of our users' sessions!) will never be preloaded
2. for sessions restored that have a bunch of windows (with more than 1 tab per window), we'll create as many preloaded tabs, also when those windows are in the background and in some cases obviously minutes / hours / years before they even get focus. That wastes a bunch of cpu and memory.

This bug will try to address (2). I'm open to ideas for (1) if it's obvious how else we should be approaching that problem.

Comment 1

[:Gijs (he/him)]

Attachment: Bug 1527081 - don't create preloaded tabs for session-restored additional tabs, r?dao

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/7703d1ff182f
don't create preloaded tabs for session-restored additional tabs, r=dao

Comment 3

[Cristina Coroiu [:ccoroiu]]

https://hg.mozilla.org/mozilla-central/rev/7703d1ff182f