TypeError: e.matches is not a function

[yesh0]

Prelude

I have searched through the issues and found this PR (#1196). However, I suppose this issue is worth a separate issue since the PR does not seem to address it correctly.

Error details

SurfingKeys: 1.13.0

Browser: Firefox 113.0.2, Arch Linux

URL: http://example.com

The console stack trace shows:

TypeError: e.matches is not a function 20 content.js:3:44208
    isEditable moz-extension://2b8c8e6b-4d91-4aba-9dee-811645fbbfab/content.js:3
    h moz-extension://2b8c8e6b-4d91-4aba-9dee-811645fbbfab/content.js:3
    s moz-extension://2b8c8e6b-4d91-4aba-9dee-811645fbbfab/content.js:3
    e moz-extension://2b8c8e6b-4d91-4aba-9dee-811645fbbfab/content.js:3
    (Async: EventListener.handleEvent)
    addEventListener moz-extension://2b8c8e6b-4d91-4aba-9dee-811645fbbfab/content.js:3
    y moz-extension://2b8c8e6b-4d91-4aba-9dee-811645fbbfab/content.js:3
    T moz-extension://2b8c8e6b-4d91-4aba-9dee-811645fbbfab/content.js:3
    <anonymous> moz-extension://2b8c8e6b-4d91-4aba-9dee-811645fbbfab/content.js:3
    <anonymous> moz-extension://2b8c8e6b-4d91-4aba-9dee-811645fbbfab/content.js:3
    <anonymous> moz-extension://2b8c8e6b-4d91-4aba-9dee-811645fbbfab/content.js:3
    <anonymous> moz-extension://2b8c8e6b-4d91-4aba-9dee-811645fbbfab/content.js:3
    inject resource://gre/modules/ExtensionContent.jsm:593
    AsyncFunctionNext self-hosted:810

Context

Reproducing steps

I was suspecting some focus event causes this since its e.target is document (there is no such document.matches). Driven by this thought I managed to reproduce it quite reliably with the following steps. But I am unsure if any other events are passing invalid arguments to isEditable though.

Way 1

1. Fresh-install Firefox & SurfingKeys
2. Go to http://example.com (you might click to first focus on the page)
3. Open another window (dev console or maybe literally any other window) and use Alt+Tab to switch between the browser window and the other window for a couple of times
4. Watch to error message show up whenever the browser loses or gain focus

Way 2

Refresh any page (with F5 or by click on the refresh button). Refreshing in the dev console with F5 works fine though, but the error message pops when I focus back into the browser.

[brookhong]

Thanks for the detail steps to reproduce.