Edit: I have tried using the zip instead of the .json or .js mentioned above as well. It still didn't work.

Check out this page to test the addon: https://www.extensiontest.com/

Check out this page to test the addon: https://www.extensiontest.com/

(Folder contains the .crx and .zip https://drive.google.com/drive/folders/1Xpwx6z46rrR4vcK4imxDsFDYgHZ9gsLA?usp=sharing) Both the crx and zip come up with no problems on the website, but using the temporary addon it doesn't work. It shows up in the top right, and it opens like it does in Chrome, but the "Toggle binge mode" button does nothing.

storage.sync can cause issues when loaded temporarily",

description: "This API can cause issues when loaded temporarily using about:debugging in Firefox unless you specify applications|browser_specific_settings > gecko > id in the manifest. Please see: https://mzl.la/2hizK4a for more.

Okay, now how exactly would I edit the manifest.json file? Do I need an external tool? Also, what is the "addon@example.com" mentioned on that site?

Okay, now how exactly would I edit the manifest.json file? Do I need an external tool?

You need just any good text editor, like Notepad++.

Also, what is the "addon@example.com" mentioned on that site?

It's ID. The extension ID must be one of the following:

• GUID
• A string formatted like an email address: extensionname@example.org

The latter format is easier to generate and manipulate. Be aware that using a real email address here may attract spam.

For example:

• "id": "extensionname@example.org"
• "id": "{daf44bf7-a45e-4450-979c-91cf07434c3d}"