How to implement a browser context menu for an extension and handle user actions?

The browser context menu is a powerful tool for integrating an extension into the familiar user interface. It provides quick access to text, link, or image processing functions directly upon right-clicking. To create and manage menu items, the special menus or contextMenus API is used, which is available in the background script or service worker.

Creating menu items is performed using the create method within the extension initialization or installation event. The developer can specify a unique item ID, title, context types for display (such as selected text, page, or link), as well as a hierarchical structure via the parentId parameter. It is important to define all necessary permissions in advance in the manifest by adding the corresponding access right.

Handling clicks on menu items is implemented through the onClicked event listener. This handler accepts a click information object containing the ID of the clicked item, information about the current tab, and specific context data, such as the text fragment selected by the user or the URL of the image that was clicked.

Based on the received data, the background script decides on further actions. This could be sending a message to the content script to change the page display, opening a new tab with analysis results, or saving information to local storage. This approach ensures an instant response to user actions without the need to open the extension popup.

To keep the interface up-to-date, developers can dynamically update or remove menu items depending on the application state or user settings. Using the update and remove methods allows for flexible adaptation of the context menu to specific use cases on various websites.