Examine source code of GrassrootsPB

{
  "name": "GrassrootsPB",
  "version": "1.0.23",
  "description": "Updates your GrassrootsPB call stats as you use LiveVox, OpenVPB, HubDialer, VoteBuilder, ImpactDialing, CallFire, PDI, or TCN.",
  "browser_action": {
    "default_icon": "icon_v2_250.png",
    "default_popup": "popup.html",
    "default_title": "GrassrootsPB",
    "browser_style": false
  },
  "icons": {
    "16": "icon_v2_16.png",
    "48": "icon_v2_48.png",
    "128": "icon_v2_128.png"
  },
  "permissions": [
    "cookies",
    "https://www.grassrootspb.com/",
    "storage"
  ],
  "background": {
    "scripts": [
      "jquery-3.3.1.min.js",
      "common.js",
      "background.js",
      "bg_cand_fetch.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "jquery-3.3.1.min.js",
        "common.js",
        "content_script.js"
      ],
      "matches": [
        "*://*.openvpb.com/*",
        "*://www.grassrootspb.com/*",
        "*://*.livevox.com/*",
        "*://*.hubdialer.com/*",
        "*://*.votebuilder.com/*",
        "*://*.tcnp3.com/*",
        "*://*.impactdialing.com/*",
        "*://*.callfire.com/*",
        "*://*.the-pdi.com/*",
        "*://*.bluevote.com/*",
        "*://*.callhub.io/*"
      ]
    }
  ],
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "CallTracker@grassrootspb.com"
    }
  }
}