Block specific script from loading on a specific site

[PseudoDistant]

I figured out DOM manipulation!
Now, instead of redirecting the user to a Flash file, Flashify will re-embed the Flash document into the page itself!

Unfortunately, I have issues with some sites reloading the page when I do this.
Consistently, when this happens, the log spits out an error thrown by Ruffle itself. Ruffle seems to believe that it's crashing, and regenerates the parts of the document that I edit.
Consistently, when this happens, the Ruffle instance is self-hosted.
I want to block

Code: Select all

https://dinky-site.net/js/ruffle.js

from executing, without blocking the rest of the site's JS.
I want to also not rely on another extension (I'm well aware that uBlock Origin can do this with a filter, that's how I'm testing for now).
How would I block this one specific script via an extension?

[moonbat]

Take a look at this page, specifically the Content Policy section.

[PseudoDistant]

Take a look at this page, specifically the Content Policy section.

Do I need to register an XPCOM component for it, or is there a listener that I could add to gBrowser or elsewhere?

[moonbat]

The other two options on that page might serve you better; personally I prefer HTTP observers since they're tab independent and will work for any HTTP request, not just clicks from a webpage. Take notes of the caveats of keeping the observer code as slim as possible though.