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1. Install "JavaScript Debugger" plugin. 2. Create a web application with JavaScript code. 3. Set a breakpoint. 4. Open a FireBug window in a browser and debug the application. The debugger suspends on the breakpoint. 5. Remove the breakpoint in FireBug. Debug application again. Result: Debugger doesn't suspend on breakpoint, but in IDE breakpoint still exists.
Good catch. The syncing of breakpoint changes back into the IDE is not implemented for Technology Preview. I will add a note to the user guide.
*** Issue 134244 has been marked as a duplicate of this issue. ***
This is more like an enhancement
A new implementation of JavaScript debugger is in trunk. Closing old issues.