Enables extensions to interact with the browser's Developer Tools. You use this API to create Developer Tools pages, interact with the window that is being inspected, inspect the page network usage.

To use this API, you must specify the devtools_page manifest key. The use of this manifest key triggers an install-time permission warning about devtools. To avoid an install-time permission warning, mark the feature as optional by listing the "devtools" permission in the optional_permissions manifest key.

Note: The "devtools" optional permission is only supported by Firefox and not Chrome (Chromium issue 1143015).



Interact with the window that Developer tools are attached to (inspected window). This includes obtaining the tab ID for the inspected page, evaluate the code in the context of the inspected window, reload the page, or obtain the list of resources within the page.

Obtain information about network requests associated with the window that the Developer Tools are attached to (the inspected window).


Create User Interface panels that will be displayed inside User Agent Developer Tools.

Browser compatibility

BCD tables only load in the browser

Note: This API is based on Chromium's chrome.devtools API.