Examine source code of personalGmailXRef

{
  "manifest_version": 2,
  "name": "pgxref",
  "version": "1.1resigned1",
  "description": "Select gmail-thread identifier (e.g. AsdF4yuiP) onto https://mail.google.com/mail/u/0/?#all/[here]",
  "homepage_url": "https://github.com/stefantkeller/personalGmailXRef.git",
  "icons": {
    "48": "pgxref-48.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2e85b4e5-e2c8-41c7-9790-b3f734f51c66}"
    }
  }
}