Examine source code of Trilium Web Clipper

{
  "manifest_version": 2,
  "name": "Trilium Web Clipper",
  "description": "Save web clippings to Trilium Notes.",
  "version": "1.1.1",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "homepage_url": "https://docs.triliumnotes.org/user-guide/setup/web-clipper",
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "contextMenus",
    "http://*/",
    "https://*/",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "web-clipper@triliumnotes.org",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "commands": {
    "saveSelection": {
      "description": "Save the selected text into a note",
      "suggested_key": {
        "default": "Ctrl+Shift+S"
      }
    },
    "saveWholePage": {
      "description": "Save the current page",
      "suggested_key": {
        "default": "Alt+Shift+S"
      }
    },
    "saveCroppedScreenshot": {
      "description": "Take a cropped screenshot of the current page",
      "suggested_key": {
        "default": "Ctrl+Shift+E"
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}