Alt or not

manifest.json

{
  "manifest_version": 3,
  "name": "Alt or not",
  "description": "Easily see alt text on Twitter & TweetDeck. Get tips on accessible text. Get warned or prevented from posting inaccessible tweets.",
  "version": "1.3",
  "options_ui": {
    "page": "options.html"
  },
  "action": {
    "default_icon": {
      "16": "icon-tiny.png",
      "32": "icon-small.png",
      "48": "icon-medium.png",
      "128": "icon-large.png"
    },
    "default_popup": "options.html"
  },
  "icons": {
    "16": "icon-tiny.png",
    "32": "icon-small.png",
    "48": "icon-medium.png",
    "128": "icon-large.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://twitter.com/*",
        "https://mobile.twitter.com/*"
      ],
      "css": [
        "alt-or-not.css"
      ],
      "js": [
        "script.js",
        "twitter.js"
      ]
    },
    {
      "matches": [
        "https://tweetdeck.twitter.com/*"
      ],
      "css": [
        "alt-or-not.css"
      ],
      "js": [
        "script.js",
        "tweetdeck.js",
        "twitter.js"
      ]
    }
  ],
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}