Examine source code of jiraDiff

{
  "manifest_version": 2,
  "name": "jiraDiff",
  "version": "1.2",
  "description": "Sane diff for jira",
  "permissions": [
    "webRequest",
    "*://*.atlassian.net/rest/gira/1/",
    "*://*.atlassian.net/*",
    "webNavigation"
  ],
  "optional_permissions": [
    "*://*/jira/*"
  ],
  "icons": {
    "64": "icons/icon64.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.atlassian.net/*",
        "*://*/jira/*"
      ],
      "js": [
        "contentScript.js",
        "external_libraries/diff_match_patch.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6d102f65-c423-46a9-b571-5ceac8307f9a}"
    }
  }
}