In the latest Firefox Nightly channel update for the macOS platform, Mozilla has introduced a new developer tool called Firefox Replay. With this tool, developers can record page content during debugging, not only to replay later to see the previous status of the page run, but also to share videos with other developers to help you debug.
Currently the developer can use Replay in the Firefox Nightly channel version of the macOS platform, but the feature is still beta in the MDN web documentation and some features are still considered pre-alpha. Since the feature is still in its early stages, you need to manually enable Firefox Replay by going to the developer tool and clicking “Enable Replay” in settings. The Record button appears in the developer’s tool after you select enable.
Firefox Replay is currently in the user research phase, and Mozilla has verified it, according to one of the people involved in the feature. Cross-platform support will be a “priority” once functionality is further developed and incorporated into a formal roadmap. By including tools such as Firefox Replay, Mozilla may be able to attract more developers back to their browsers. This will ensure that more sites are tested in Firefox, providing a better experience for Firefox users who may have switched to a competitor’s browser on a daily basis.
For more information on Replay, visit: https://developer.mozilla.org/en-US/docs/Mozilla/Projects/WebReplay