How can I search the API(s) for developing Firefox addons?
I’m wonder if its possible to change or refresh tab favicons and only favicons (without refreshing whole tabs). I looked through some pages on MDN and about WebExtensions but I haven’t found any search bars. I’ve also done Google searches specifically for that with no luck.
There isn’t anything to specifically update the favicon of a tab. But you can do the exact same thing websites can update their favicon with; run a content script on the web page that modifies the favicon. Firefox will then show whatever the new icon image is in the tab bar.
I don’t have a better example but the content script of an extension I wrote updates the favicon during media playback in a tab. As an overview it creates a canvas of the original favicon, creates a new link element as the “new favicon”, updates that canvas during playback, and then sets the created link element href attribute to the data uri created from the canvas.
I know you can do this because of the AWS Favicon Update add-on. My advice would be to take a look at how it does it by downloading the XPI from the versions page and unziping its content.
Edit: I did so and its mechanism is fairly basic: it’s a content script that replaces the favicon’s URL in the link tag in the document.
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