Mozilla text scrambler

Im completely confused about this. Sometimes after a while, mozilla firefox the internet browser, will start to put my cursor at random places in the textbox im typing, whether its the searchbar or a forum post.
iv ran AdAware and Norton, neither found anything so if its a virus thing, what is it? Im typing this in internet explorer and it works fine but heres a copy/pasted text from Mozilla.
its suppost to say "im typing this and why isnt it working?"
but instad i get "im typing ts nhisnit wking?ro t yw daih"
im using the skin "black japan" could the skin cause this? and if so, why didnt it start weeks ago?

cmon people, i know theres a hideously simple answer to this.

Delete all Mozilla Firefox profiles, un-install Firefox, re-install it.

- Baring in mind you should store your Bookmarks/Favourites.

i did reinstall

Including deleting your Profiles..? ;\

hmmm. i did the add/remove programs thingy. wheres the profiles list located?

What version or you useing if it is 105 this board is not as capatible as it was with 102 as that is what I had.The only boards that campatible are phpbb boards not vb or the latest version of it.They have to make the board compatible as the board I moderate as been fully updated.

boards? you speak crazyness. and i am using 1.5

Do a clean install:

- First Remove via Add/Remove programs
- Then remove the profile (Save bookmarks and cookies)
- After, DELETE the Mozilla Firefox Folder in "Program Files"(people always miss that one)
- Reinstall

If you are still having problems then something else might be wrong with your computer.