Examine source code of harpoon-tabs

{
  "manifest_version": 2,
  "name": "Harpoon-Tabs",
  "version": "2.2.3",
  "description": "Pin tabs and anchor tags within each tab, then jump back fast with keybinds, scroll restore, and local saved sessions.",
  "browser_specific_settings": {
    "gecko": {
      "id": "@harpoon-telescope.reklai",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentScript.js"
      ],
      "match_about_blank": true,
      "run_at": "document_idle"
    }
  ],
  "commands": {
    "open-tab-manager": {
      "suggested_key": {
        "default": "Alt+T"
      },
      "description": "Open Tab Manager panel"
    },
    "tab-manager-add": {
      "suggested_key": {
        "default": "Alt+Shift+T"
      },
      "description": "Add current tab to Tab Manager"
    },
    "tab-manager-tab-1": {
      "suggested_key": {
        "default": "Alt+1"
      },
      "description": "Jump to Tab Manager slot 1"
    },
    "tab-manager-tab-2": {
      "suggested_key": {
        "default": "Alt+2"
      },
      "description": "Jump to Tab Manager slot 2"
    },
    "tab-manager-tab-3": {
      "suggested_key": {
        "default": "Alt+3"
      },
      "description": "Jump to Tab Manager slot 3"
    },
    "tab-manager-tab-4": {
      "suggested_key": {
        "default": "Alt+4"
      },
      "description": "Jump to Tab Manager slot 4"
    }
  },
  "options_ui": {
    "page": "optionsPage/optionsPage.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    },
    "default_popup": "toolbarPopup/toolbarPopup.html",
    "default_title": "Harpoon-Tabs"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  }
}