Failed to detect duplicated tabs on Firefox 89

[piroor]

After logging on Nightly 89.0a1 I've realized that TST cannot detect duplicated tabs anymore. The detection method still works on Firefox 87.0, so something change triggers this problem. Hmm...

[piroor]

On Nightly 89.0a1, browser.sessions.getTabValue for a newly opened tab sometimes fails. It looks required to wait until its initialization is finished - on my case 100ms is enough safe but it may be different on some environments.

[piroor]

https://hg.mozilla.org/mozilla-central/rev/018c3b3935934a697d422ba551b60894e773c202
https://hg.mozilla.org/mozilla-central/rev/26082a39ec6371d911af53e971fb736434a20667
https://hg.mozilla.org/mozilla-central/rev/0a97bfe2a11241da32e2bbc402e8090f5cf07c33

There are some changes for the "Fission" project (multi-processes), they can trigger this problem.

[piroor]

On my case 400msec delay is required for 100% successful detection. 350msec delay just successes with 80% probability. This delay is painfully large...

[piroor]

1701900 - sessions.getTabValue() requires too large delay to get expected value for a duplicated tab
https://bugzilla.mozilla.org/show_bug.cgi?id=1701900

[irvinm]

@piroor do you want to add the label "bug of Firefox itself" for tracking purposes?

[piroor]

Not only around duplicated tabs, this change of Firefox looks to break tree restoration on the startup.

[piroor]

I've introduced a change 1f22694 to reduce the side effect I commented at #2845 (comment)

[irvinm]

@grahamperrin, what does this have to do with this issue? It is a reasonable question, but probably better discussed in "Discussions". Auto Tab Discard is likely part of it ... and the "dimmed" tab is likely a "discarded" tab (depends on TST CSS) but many addons implement that feature. The planet\globe just says that the favico isn't available or hasn't been loaded yet.

[github-actions]

This issue has been labeled as "stale" due to no response by the reporter within 1 year (and 7 days after last commented by someone). And it will be closed automatically 14 days later if not responded.

[github-actions]

This issue has been closed due to no response within 14 days after labeled as "stale", 7 days after last reopened, and 7 days after last commented.