Examine source code of IndicateTLS

{
  "manifest_version": 2,
  "name": "IndicateTLS",
  "short_name": "IndicateTLS",
  "version": "0.4.0",
  "default_locale": "en",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "https://github.com/jannispinter/indicatetls",
  "developer": {
    "name": "Jannis Pinter",
    "url": "https://github.com/jannispinter/indicatetls"
  },
  "icons": {
    "48": "icons/icon_48.png",
    "96": "icons/icon_96.png"
  },
  "applications": {
    "gecko": {
      "strict_min_version": "62.0",
      "id": "{252ee273-8c8d-4609-b54d-62ae345be0a1}"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "page_action": {
    "browser_style": true,
    "default_icon": "icons/tlsunknown.png",
    "default_title": "IndicateTLS",
    "show_matches": [
      "https://*/*"
    ],
    "hide_matches": [
      "https://addons.mozilla.org/*"
    ]
  },
  "permissions": [
    "tabs",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "http://*/*",
    "https://*/*"
  ]
}