Examine source code of Search from Popup or ContextMenu

{
  "manifest_version": 2,
  "version": "8.1",
  "name": "Search from Popup or ContextMenu",
  "short_name": "SPC",
  "description": "Fork of \"Swift Selection Search\". When you select text or image on a webpage, you can quickly search from the popup or contextmenu",
  "author": "Yoshifumi Fuyuno",
  "homepage_url": "https://github.com/YoshifumiFuyuno/Search-from-Popup-or-ContextMenu/issues",
  "icons": {
    "48": "res/icons/icon48.png",
    "96": "res/icons/icon96.png"
  },
  "background": {
    "page": "background.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "102.0",
      "id": "{d4c9d93a-c00c-49da-b57e-424c20160155}"
    }
  },
  "options_ui": {
    "page": "settings/settings.html",
    "open_in_tab": true
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "contextMenus",
    "storage",
    "tabs",
    "clipboardRead",
    "unlimitedStorage"
  ],
  "optional_permissions": [
    "bookmarks",
    "webRequest",
    "webRequestBlocking",
    "clipboardWrite",
    "nativeMessaging"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "exclude_matches": [
        "*://*.officeapps.live.com/*"
      ],
      "all_frames": true,
      "run_at": "document_start",
      "js": [
        "content-scripts/page-script.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/highlight.js"
      ]
    },
    {
      "matches": [
        "https://github.com/*"
      ],
      "js": [
        "content-scripts/addExampleEngine.js"
      ]
    }
  ],
  "commands": {
    "open-popup": {
      "suggested_key": {
        "default": "Ctrl+Shift+Space"
      },
      "description": "Toggle open/close popup"
    },
    "toggle-auto-popup": {
      "suggested_key": {
        "default": "Ctrl+Shift+U"
      },
      "description": "Toggle auto popup opening"
    },
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Alt+S"
      },
      "description": "Toggle open/close extension sidebar"
    }
  },
  "sidebar_action": {
    "default_icon": {
      "48": "res/icons/icon48.png",
      "96": "res/icons/icon96.png"
    },
    "default_panel": "sidebar.html",
    "open_at_install": false
  },
  "browser_action": {
    "default_icon": {
      "48": "res/icons/icon48.png",
      "96": "res/icons/icon96.png"
    },
    "default_title": "SPC - toggle popup"
  },
  "omnibox": {
    "keyword": "s"
  },
  "web_accessible_resources": [
    "res/icons/*"
  ]
}