Example:
Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat
Turns into this when copying to Firefox browser:
Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod
tincidunt ut laoreet dolore magna aliquam erat volutpat. Lorem ipsum dolor sit amet,
consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore
magna aliquam erat volutpat
These are broken sentences. Don't know if it is only with Firefox though...
UPDATE: Here is how it looks like in Notepad

Here is how it looks in Firefox after copying from Notepad:

What i have found also is that if i open new Notepad document, write several sentences without line breaks and copy this to Firefox, the formatting retains and no unnecessary line breaks are added.
