Browser.theme API

stefanvd · June 15, 2017, 6:54pm

Hi everyone,

In the last blog post for Firefox v55.
https://blog.mozilla.org/addons/2017/06/14/webextensions-firefox-55/comment-page-1/#comment-224016

There is support for the browser.theme, I already got this working in my Turn Off the Lights Firefox extension. And it works great! However, I got few issues:

It doesn’t support the “theme” as “optional_permissions” (in the manifest file)
Is there a way to detect the current browser theme, this set it back later

Thanks,
Stefan
Developer
www.turnoffthelights.com

NilkasG · June 16, 2017, 12:12am

Considering this is still open, I think not:
https://bugzilla.mozilla.org/show_bug.cgi?id=1329242

stefanvd · June 16, 2017, 8:33pm

Thank you Niklas for the link!

It is strange why Firefox only lets set the browser theme API. And not the “read” current theme status.

Thanks,
Stefan

NilkasG · June 21, 2017, 11:54am

Hm. It may be possible. This example assumes that there is only ever one extension of the type theme active, enabling another will disable the previous one:

github.com

mdn/webextensions-examples/blob/master/theme-switcher/switcher.js

var themeList = document.getElementById('theme-list');

function enableTheme(e) {
  browser.management.setEnabled(e.target.value, true);
  e.preventDefault();
  window.close();
}

browser.management.getAll().then((extensions) => {
  for (let extension of extensions) {
    if (extension.type !== 'theme') {
      continue;
    }
    let option = document.createElement('option');
    option.textContent = extension.name;
    option.value = extension.id;
    if (extension.enabled) {
      option.selected = true;
    }
    themeList.appendChild(option);

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stefanvd · June 21, 2017, 11:47am

But what if you use the default Firefox theme, and want to go back to this default Firefox theme.
There is no Theme extension?

Thanks,
Stefan

NilkasG · October 24, 2019, 2:12pm

Apparently, there is (and there is also an entry on the about:addons page):

stefanvd · June 25, 2017, 1:51pm

Hi Niklas,

Is there a way without the “management” permission?
And do you find a complete browser.theme API list. (of what you can change in the Firefox web browser)

Thanks,
Stefan

NilkasG · June 26, 2017, 1:52pm

Unfortunately, this “engineering plan” is the only document with actual API information I could find. It has no date on it, but I think I ran across the very same thing at least two month ago.

This lack of documentation makes it hard to answer your other question, but I think the management API is, and will be, the way to go here.