Examine source code of Side View Custom

{
  "manifest_version": 2,
  "name": "Side View Custom",
  "version": "0.6.4436",
  "description": "Open a mobile view of a page in the sidebar",
  "icons": {
    "48": "side-view.png",
    "96": "side-view.png"
  },
  "author": "Mozilla (https://mozilla.org/)",
  "homepage_url": "https://github.com/mozilla/side-view/",
  "applications": {
    "gecko": {
      "id": "side-view@bees.dev",
      "strict_min_version": "57.0a1"
    }
  },
  "commands": {
    "toggle-sidebar": {
      "suggested_key": {
        "default": "Alt+1"
      },
      "description": "Toggle the sidebar"
    }
  },
  "background": {
    "scripts": [
      "build/buildSettings.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "side-view.svg",
    "default_popup": "popup.html",
    "default_title": "Open Side View",
    "browser_style": true
  },
  "sidebar_action": {
    "open_at_install": false,
    "default_icon": "side-view.svg",
    "default_title": "Side View",
    "default_panel": "sidebar.html",
    "browser_style": false
  },
  "page_action": {
    "default_icon": "side-view.svg",
    "default_title": "Open Side View",
    "show_matches": [
      "http://*/*",
      "https://*/*"
    ],
    "browser_style": true
  },
  "web_accessible_resources": [],
  "permissions": [
    "activeTab",
    "tabs",
    "<all_urls>",
    "storage",
    "contextMenus",
    "webRequest",
    "webRequestBlocking",
    "bookmarks",
    "management"
  ]
}