I've gone through most of the Haxeflixel demos in Firefox/Flash and they all seem inconsistent with the mouse. It seems like mouse clicks are often ignored.
For example, I went through the
http://haxeflixel.com/demos/Cursor/ demo and tried clicking each button a few times in a row, click-click-click. About 5% of my mouse clicks get ignored, the button doesn't always light up. Similarly, for something like FlxCaveGenerator, if I click the "Regenerate" button 50 times, maybe about 2-3 times the button just won't work. I can keep my mouse held down on the button, and it's like it just never caught the mousedown event -- the button stays unlit.
I also went through the HaxeFlixel "TurnBasedRPG" tutorial myself. The game works OK when it's launched with Adobe's stand-alone flash player, but it has the same mouse issue when it's launched within the browser.
I've duplicated the problem on two different PCs, so I know it's not specific to one computer or one mouse. Has anybody else experienced this problem? Is it a problem with Flash, or with HaxeFlixel, or with Firefox, or Firefox's Flash plugin?