Ctrl-V does not update cursor position?

Hi,

I am using the 3.0.1.3 web client on Firefox and found the following very annoying behavior: When I input some text and paste using Ctrl-V then the next character I input will appear before the pasted text.
In more detail:
1. I click "Add Comment"
2. I type "This is some text "
3. I hit Ctrl+V to paste the text "and this is more" from the clipboard
4. At this point the cursor is at the end of the line (right after "more")
5. Now I hit 'x'. The character x is not appended after "more" but is instead right before "and" (the position at which I did paste).

This is already bad, but it gets worse:
6. I hit the "End" key to move the cursor to the end of the line and the cursor in fact shows up at the end of the line.
7. Now I hit backspace to delete the last character on the line. Instead of deleting the last character on the line, the last character before the pasted content is deleted.
Similarly, if I hit "End" and then start typing in new text. The first character is appended to the end of the line, then the cursor mysteriously jumps back to the place at which I pasted the other text and continuous inserting text there.

It looks like pasting into the comment editor completely screws up this editor? Is there a workaround for that?

Thanks,

Daniel