Can one create a page modifying extension without any UI overlay in browser.xul?

[moonbat]

My extension PermissionsPlus overlays the PageInfo dialog and about:permissions, but originally had no reason to overlay browser.xul. The Javascript files for these 2 components are only loaded when the user accesses them, but I needed to perform some initialization at browser startup. Simply creating an empty overlay for the browser with a script tag referencing my script (that has a window.onload to do its stuff) doesn't work and gets logged as 'no chrome registered for script.js'.

So I was forced to add a toolbar button as well. Is it possible to make a traditional overlay extension that doesn't overlay the browser, or alternately, doesn't modify the UI at all?

[JustOff]

Simply creating an empty overlay for the browser with a script tag referencing my script (that has a window.onload to do its stuff) doesn't work and gets logged as 'no chrome registered for script.js'.

That's weird, I guess you missed something very simple.

Is it possible to make a traditional overlay extension that doesn't overlay the browser, or alternately, doesn't modify the UI at all?

Yes, of course, here is an example of the second approach.

[moonbat]

I was doing more or less what you have done, my overlay is identical with just a stringbundleset, but for one thing -
Is there a difference between doing

Code: Select all

window.addEventListener('load', function() { activestopbutton.init(); }, false);

and simply calling

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window.addEventListener('load', activestopbutton.init, false);

as I've been doing?

[JustOff]

Yes, see addEventListener() : The value of this within the handler.