[Affected versions]: Nightly 56.0a1 [Affected platforms]: Platforms: Windows 10 x 64, Mac OS X 10.12 and Ubuntu 16.04 x64. [Steps to reproduce]: 1. Open Firefox and go to https://devtools-html.github.io/debugger-examples/examples/todomvc/ 2. Open Debugger. 3. From "Watch Expressions" section click on "Add Watch Expression" and type the expression you'd like to watch into the text field (e.g el: this) and press "Enter". 4. Navigate to todo-view.js 5. Right click on the gutter, any line with written code, select add a breakpoint (e.g line 34) 6. Go back to todmvc and add a todo item in the UI and observe "initialize" function in Source pane. 7. Double click on "this". 8. Click anywhere you want to edit in the input field populated with expression added before. [Expected result]: The cursor should move its position. [Actual result]: The position of the cursor does not change in "watch expression" using the mouse. [Note]: Using keyboard arrows you can easily move the cursor position.

The behavior changed in this bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1357206

There's a PR up with a fix for this issue: https://github.com/devtools-html/debugger.html/pull/3333

This has been fixed in the latest release of Nightly.

Build ID: 20170727100347 User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0 Verified as fixed on Firefox Nightly 56.0a1 on Windows 10 x 64, Windows 7 x32, Mac OS X 10.12 and Ubuntu 16.04 x64.