1521110 - Child actors not initialising for privileged web content (about:* / chrome:*) when allFrames is set

Status: NEW

(Toolkit :: Async Tooling, defect, P2)

Description

[Andreas Tolfsen ❲:ato❳]

I have found something I’m not sure is a bug or not:

When you register a child actor with allFrames set, it isn’t
initialised automatically on privileged web content documents such
as about:sessionrestore unless you specify a match rule for "about:*"
or "about:sessionrestore".

Since I haven’t found a way to specify a match rule for ‘everything’,
i.e. "*", I am left in a situation where I can get the child actor
to either initialise on about:sessionrestore or in every other
normal web content document.

I configure the actor this way:

const ACTORS = {
 Log: {
   child: {
     module: "chrome://foo/content/actor/LogChild.jsm",
     events: {
       pageshow: {mozSystemGroup: true},
       pagehide: {mozSystemGroup: true},
     },
     allFrames: true,
   },
 },
};

I then ensure to run Firefox with browser.fission.simulate set from
the command line:

% ./mach run --setpref "browser.fission.simulate=true" -- about:sessionrestore

If this is intended behaviour, is there some way I can load the
actor for all documents?

Comment 1

[Matthew N. [:MattN]]

This also affects mochitest-chrome which use chrome:// URIs and affected form autocomplete-related tests for bug 1474143.

Comment 2

[Kris Maglione [:kmag]]

You need to specify match patterns for those URLs if you want to match them.

Comment 3

[Andreas Tolfsen ❲:ato❳]

Yes, specifying a match pattern works for chrome:/about:, but then
how can you match regular web content? The * selector is not valid.

Comment 4

[Kris Maglione [:kmag]]

"<all_urls>"