Examine source code of imgxtension

{
  "name": "imgxtension",
  "description": "Extension for modifying the imgflip website for a better user experience.",
  "version": "3.2.1",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "contextMenus",
    "http://*.imgflip.com/*",
    "https://*.imgflip.com/*"
  ],
  "browser_action": {
    "default_popup": "popup/index.html",
    "default_icon": "imgicon.png"
  },
  "background": {
    "scripts": [
      "scripts/firefox/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.imgflip.com/*"
      ],
      "css": [
        "globaltheme.css"
      ],
      "js": [
        "scripts/break_ads.js",
        "scripts/update-theme.js",
        "scripts/flip-buttons.js",
        "scripts/top-posts.js",
        "scripts/hide-blocked.js",
        "scripts/show-icons.js",
        "scripts/firefox/msmg-link.js",
        "scripts/show-mod.js",
        "scripts/notifContent.js",
        "scripts/font-select.js",
        "scripts/firefox/custom-profiles.js",
        "scripts/pin_memechats.js",
        "scripts/sex.js",
        "scripts/return_fpb.js",
        "scripts/settings-btn.js",
        "scripts/memechat_imgs.js",
        "scripts/splitscreen_streams.js",
        "scripts/total-followed.js",
        "settings/options.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "themes.css",
    "globaltheme.css",
    "scripts/flip-buttons.css",
    "scripts/top-posts.css",
    "scripts/pin_memechats.css",
    "scripts/return_fpb.css",
    "settings/options.css",
    "themes/msmg-purple.css",
    "themes/dark-purple.css",
    "themes/orange.css",
    "themes/sky.css",
    "themes/suspicious-green.css",
    "fonts/papyrus.ttf",
    "fonts/comic-sans.ttf",
    "fonts/times-new-roman.ttf",
    "fonts/chalkduster.ttf",
    "fonts/wingdings.ttf",
    "fonts/audiowide.ttf",
    "fonts/exo.ttf",
    "fonts/orbitron.ttf",
    "fonts/permanent-marker.ttf",
    "fonts/saira-stencil-one.ttf",
    "fonts/tektur.ttf",
    "fonts/pricedown.ttf",
    "fonts/love-ya-like-a-sister.ttf",
    "fonts/andy.ttf",
    "fonts/vcr-ocd.ttf",
    "fonts/copperplate.ttf",
    "fonts/pacifico.ttf",
    "fonts/silkscreen.ttf",
    "fonts/mojangles.ttf",
    "fonts/impact.ttf",
    "fonts/ubuntu.ttf",
    "fonts/slackey.ttf",
    "fonts/montserrat.ttf",
    "images/msmg-pc.svg",
    "images/msmg-mobile.svg",
    "images/imgmob-hue.png",
    "images/imgflip-hue.png"
  ],
  "options_page": "settings/options.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "{febb9da1-1151-49cf-a74c-e315b920e926}"
    }
  }
}