1665099 - Unable to open about:processes when Tree Style Tab sidebar is enabled

Status: RESOLVED FIXED

(Core :: DOM: Content Processes, defect)

Description

[Fanolian]

Attachment: Error message from Browser Console.png

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:82.0) Gecko/20100101 Firefox/82.0
Build ID: 20200915092930

Steps to reproduce

1. Install extension Tree Style Tab 3.5.27 (TST) in a new profile.
2. Make sure TST sidebar is shown. (You can press F1 to toggle the TST sidebar)
3. Navigate to about:processes.

Actual result

No information is shown. In Browser Console there is an error message after a short pause:

Uncaught (in promise)
Exception { name: "NS_ERROR_FAILURE", message: "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIURI.host]", result: 2147500037, filename: "chrome://global/content/aboutProcesses.js", lineNumber: 208, columnNumber: 0, data: null, stack: "_getDOMWindows/windows<@chrome://global/content/aboutProcesses.js:208:1\n_getDOMWindows@chrome://global/content/aboutProcesses.js:204:35\n_getProcessDelta@chrome://global/content/aboutProcesses.js:280:21\ngetCounters@chrome://global/content/aboutProcesses.js:348:22\n_updateDisplay@chrome://global/content/aboutProcesses.js:904:26\nupdate@chrome://global/content/aboutProcesses.js:891:16\n", location: XPCWrappedNative_NoHelper }

aboutProcesses.js:208

Expected result

After a short pause, about:processes should show CPU, memory, etc. information about various Nightly processes.

Notes

1. The issues only occurs when TST sidebar is shown. Bookmark, History sidebars are not affected.
2. about:processes works when TST sidebar is hidden, even if TST is still enabled.
3. I tried some older versions of TST (3.3.6+) and they all have the same issue.

It was originally reported at TST's github. Its author thinks this is a Nightly issue rather than the extension's.

Comment 1

[Fanolian]

From Mozregression:

Last good Nightly: 2020-09-06
First bad Nightly: 2020-09-07
pushlog: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=5a77c0b857048d46fe4bced46b2234b49dcc84a2&tochange=ca131344e7fcf46f50e09bea63141d2578f18b7b

Further bisecting autoland builds:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=0a3de0138b450f7ed71d2ef371c2e8e602a2acaf&tochange=b8af21c6e6780dbca280115d97aa3ae91e7614f4

This is regressed by bug 1652785.

Marking the tracking status for Firefox 80, 81 as disabled since about:processes is a Nightly-only feature.

Comment 2

[David Teller [:Yoric] - still alive but not very active]

Oh, not good.
Does the same problem show up with about:performance?

Comment 3

[Fanolian]

(In reply to David Teller [:Yoric] (please use "needinfo") from comment #2)

Oh, not good.
Does the same problem show up with about:performance?

No. about:performance works completely fine.

Comment 4

[David Teller [:Yoric] - still alive but not very active]

So, the error seems to be in the getter nsIURI.host, here.

Comment 5

[David Teller [:Yoric] - still alive but not very active]

Using WebExtensionPolicy.getByURI should hopefully solve the issue.

Comment 6

[David Teller [:Yoric] - still alive but not very active]

Attachment: Bug 1665099 - Use WebExtensionsPolicy.getByURI instead of WebExtensionsPolicy.getByHost;r?florian

Comment 7

[Chris Peterson [:cpeterson]]

Tracking about:processes bug for Fission M7 Beta

Comment 8

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/16af156a29a4
Use WebExtensionsPolicy.getByURI instead of WebExtensionsPolicy.getByHost;r=florian,rpl

Comment 9

[Cristian Brindusan [:cbrindusan]]

https://hg.mozilla.org/mozilla-central/rev/16af156a29a4