Trackpad, Flash and Firefox 23

Hey,

I have trouble to use the Trackpad with Firefox 23 and sites who are developped under Flash.

To scroll up and down with 2 fingers is impossible.

I can do if I put the pointer of the mouse on the scroll barre and if I click, but with 2 fingers it's impossible.

I try the new and an old version of Flash: it's the same thing.

But if I use the Firefox 22, it's OK.

I wrote in a Mozilla's forum, but for them, Flash is guilty because I have no problem with sites who are not under Flash.

I wrote in a Adobe's forum, but for them, Firefox is guilty because I can use the Trackpad with Google Chrome (for example). Finally they suggest me to write to Mac's forum.

Thanks for your help.