Reader View button does not update when readerable page is opened in background

[Ascrod]

See also: https://forum.palemoon.org/viewtopic.php?p=129429#p129429

[Ascrod]

Still looking at this issue. It has to do with how page load events are listened to here:

readerview/chrome/content/readerMain.js

Lines 63 to 68 in 82fbda5

	init() {
	gBrowser.addEventListener("AboutReaderContentLoaded", this, false, true);
	gBrowser.addEventListener("DOMContentLoaded", this, false);
	gBrowser.addEventListener("pageshow", this, false);
	gBrowser.addEventListener("pagehide", this, false);
	},

[Ascrod]

The events mentioned above fire correctly, but the code for handling them (as well as the MozAfterPaint event) is faulty. The issue lies in the use of gBrowser and content with the assumption that the tab firing the events is the currently selected tab.

I think most of this can be resolved by using gBrowser.getBrowserForDocument with the target document passed in with the event.

[Ascrod]

Resolved with 0667ae4.