This page describes the WebExtensions devtools APIs as they exist in Firefox 54. Although the APIs are based on the Chrome devtools APIs, there are still many features that are not yet implemented in Firefox, and therefore are not documented here. To see which features are currently missing please see Limitations of the devtools APIs.

The API lets a devtools extension get information about network requests associated with the window that the devtools are attached to (the inspected window).

Like all the devtools APIs, this API is only available to code running in the document defined in the devtools_page manifest.json key, or in other devtools documents created by the extension (such as the panel's own document). See Extending the developer tools for more.

Fired when the user navigates the inspected window to a new page.

Browser compatibility

ChromeEdgeFirefoxFirefox for AndroidOpera
getHAR Yes No60 No Yes
onNavigated Yes No54 No Yes
onRequestFinished Yes No60 No Yes


This API is based on Chromium's API.

Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.

Document Tags and Contributors

 Contributors to this page: wbamberg, andrewtruongmoz
 Last updated by: wbamberg,