WebDriver BiDi is an extension of the WebDriver specification that offers a bidirectional communication between a webdriver compatible client and a remote end like Firefox. That means that beside sending commands to the browser and receiving responses, it will be also possible to register for certain events (e.g page load, network interception).
If you find a bug with Fission enabled please file a bug under Remote Protocol :: WebDriver BiDi.
WebDriver BiDi Milestone 1 (required)
46 Total; 33 Open (71.74%); 13 Resolved (28.26%); 0 Verified (0%);
WebDriver BiDi Milestone 1 (reserved)
0 Total; 0 Open (0%); 0 Resolved (0%); 0 Verified (0%);