An Options page enables you to define preferences for your extension that your users can change. Users can access the options page for an extension from the browser's add-ons manager:
The way users access the page, and the way it's integrated into the browser's user interface, will vary from one browser to another.
You can open the page programmatically by calling runtime.openOptionsPage().
Options pages have a Content Security Policy that restricts the sources from which they can load resources, and disallows some unsafe practices such as the use of eval(). See Content Security Policy for more details.
To create an options page, write an HTML file defining the page. This page can include CSS and JavaScript files, like a normal web page. This page, from the favourite-color example, includes a JavaScript file:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"/> </head> <body> <form> <label>Favorite color</label> <input type="text" id="color"/> <button type="submit">Save</button> </form> <script src="options.js"></script> </body> </html>
JavaScript running in the page can use all the WebExtension APIs that the add-on has permissions for. In particular, you can use the storage API to persist preferences.
Package the page's files in your extension.
You also need to include the options_ui key in your manifest.json file, giving it the URL to the page.
"options_ui": { "page": "options.html", "browser_style": true },
Note: Google Chrome and Opera use chrome_style instead of browser_style, so if you wish to support them, you need to add both keys.
See the options_ui page for sharing options between your options page and background or content scripts.
For details on how to design your options content to match the style of Firefox, see the Photon Design System and browser styles documentation.
The webextensions-examples repository on GitHub includes the favourite-color example which implements options page features.
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https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface/Options_pages