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Then locate a line for your breakpoint and click to the left of the line number in the gray selection border then it set a red circle:<br/><br/><br/>
[[Image:Yshen6_openFile.JPG]]<br/><br/><br/>
Now we can run Firefox from Visual Studio by pressing F5 or by clicking Debug > Start Debugging, This will require you to save firefox.sln file, save it within the firefox.exe directory:<br/><br/><br/>
[[Image:Yshen6_saveFile.JPG]]:<br/><br/><br/>
Then Visual Studio will run a console window with lots of messages related to debugging within the code. We will end up at the location of the breakpoint(if it is called during the compiling).