Open
Bug 1425587
Opened 7 years ago
Updated 2 years ago
Investigate avoiding creating about:blank content viewers that we then throw away
Categories
(Firefox :: General, enhancement, P3)
Firefox
General
Tracking
()
NEW
Tracking | Status | |
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firefox59 | --- | affected |
People
(Reporter: Gijs, Unassigned)
References
Details
Attachments
(1 file)
2.77 KB,
patch
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Details | Diff | Splinter Review |
This came up in bug 1425466, but also seems like it's quite related to bug 1397365 (though I could be wrong!). :kmag, did you have specific culprits in mind in bug 1425466 comment 9 where we can avoid creating about:blank ?
Comment 1•7 years ago
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This is a diagnosis patch I used to figure out what is triggering it. It seems to be the _securityUI getter in browser.xml that creates about:blank documents in the main browser window.
Comment 2•7 years ago
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I'm not sure about specific culprits, but I came across this in a lot of places when I was investigating certain WebExtension performance issues. In the profiles, our code creates a docShell, then some other frame script or process script code with an observer causes a document viewer to be instantiated, which triggers a bunch of other observers, before we blow all of it away. WebExtensions code was probably also a culprit in a lot of cases, before we migrated our content script tracking code to C++. This turns up in fairly obvious ways in content process startup profiles, so it shouldn't be hard to narrow down.
Priority: -- → P3
Updated•2 years ago
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Severity: normal → S3
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Description
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