well, I dont know if this happened to any of you but...

when I select the share -> facebook link on YouTube a window pops up (like its supposed to) only the address is not quite the one it should be (C:/Users/*censored*/AppData/Roaming/Mozilla/Firefox/Profiles/*censored*.default/extensions/fastdial@telega.phpnet.us/chrome/content/fastdial.html)
[deleted the file:/// so the page does not convert it to a link since there is no "code" option available here]

funny it only happens on FB, other links work fine.

thought it was a "stylish" issue, so I disabled it and restarted FF, no change.
AdBlock Plus is also disabled.

using FF 3.5.2 and FD well, the last version downloaded on this page
also happened in FF 3.5.1 ( update was between restarts of FF )

tried logging out of FB with the same result.
also tried the "clear private data" option in FF with no positive result.
strange, right?