Examine source code of Streamer Mode for Firefox

{
  "manifest_version": 2,
  "name": "Streamer Mode for Firefox",
  "version": "1.7.1",
  "developer": {
    "name": "Aidan Raney",
    "url": "https://devaidan.com/"
  },
  "author": "Aidan Raney",
  "homepage_url": "https://github.com/AidanSpeakss/streamer-mode-for-firefox",
  "description": "Hides personal information from pages, similar to Discord's Streamer mode.",
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_title": "Streamer Mode for Firefox!",
    "default_popup": "options.html"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": false
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "content_scripts": [
    {
      "exclude_matches": [
        "http://*.docs.google.com/*",
        "https://*.docs.google.com/*",
        "http://docs.google.com/*",
        "https://docs.google.com/*",
        "https://coronavirus.data.gov.uk/*",
        "http://coronavirus.data.gov.uk/*"
      ],
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*"
      ],
      "js": [
        "background.js"
      ]
    },
    {
      "exclude_matches": [
        "https://coronavirus.data.gov.uk/*",
        "http://coronavirus.data.gov.uk/*"
      ],
      "matches": [
        "http://*/*",
        "https://*/*",
        "file:///*"
      ],
      "css": [
        "background.css"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "http://*.docs.google.com/*",
        "https://*.docs.google.com/*",
        "http://docs.google.com/*",
        "https://docs.google.com/*"
      ],
      "js": [
        "exclude.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8a05d8ec-f62f-4bcb-a93c-b2d606fb562f}"
    }
  }
}