Use a custom Firefox binary to debug mochitests (useful when working against a Debug build): `./mach mochitest path/to/test.js --jsdebugger --jsdebugger-path path/to/firefox/binary` (bug)
Sebo (again!) added a really useful feature to the Measuring Tool which lets users resize a measured region by simple drag and drop (bug).
Micah is working on simulating double-tap gestures in RDM. This bug has her work-in-progress.
The profiler UI was updated in about:debugging and allows the user to select helpful presets instead of having to fiddle with complicated settings (bug)
Last round of polish for Instant Evaluation (né Eager Evaluation)
Don’t print warning caused by Instant Eval (Bug 1616721)
Fix issue with XPIDL code being executed although it wasn’t side-effect free (Bug 1620087)
Display autocomplete popup at the top of the input (when possible) to avoid covering the instant eval results (Bug 1609942)
Autocomplete now relies on instant evaluation (Bug 1580083)
This makes the popup available when calling functions (e.g. `sum(a, b).to` will show `toExponential` in the popup, which wasn’t the case before)
In the Browser Toolbox, you can now select the context in which you want to evaluate a given expression (Bug 1605329)
Formatting for Action Cable WebSocket messages (bug)
The Network monitor is showing a link to the place where the request was initiated. Clicking on the links navigates the user to the Stack Trace side panel with the entire stack trace (bug).
It’s possible to use wildcards to block requests. See async-*.js example of the following screenshot.
It’s possible to filter WebSockets messages with regular expressions (bug)