Examine source code of DejaVu

{
  "manifest_version": 2,
  "name": "DejaVu",
  "version": "0.0.2resigned1",
  "description": "Dejavu is a WebExtension allowing users to save and customize their reading history on forums. Dejavu brings unique features that change the users' browsing experience on community sites.",
  "icons": {
    "48": "icons/logo_48x48.png",
    "64": "icons/logo_64x64.png",
    "128": "icons/logo_128x128.png",
    "256": "icons/logo_256x256.png"
  },
  "permissions": [
    "tabs",
    "notifications",
    "contextMenus",
    "storage",
    "*://*.reddit.com/*",
    "*://*.news.ycombinator.com/*"
  ],
  "browser_action": {
    "default_icon": "icons/logo_48x48.png",
    "default_title": "DejaVu",
    "default_popup": "popup/index.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{78ae2a10-fbcf-4e50-953a-16f62ff55595}"
    }
  }
}