Immediately after installing FF 16.0.1 my spell check stopped working correctly and is marking correctly spelled words as incorrect. No other changes were made.
The red line appears under only part of what it thinks are misspelled words that are really okay, and if you click on the red line to correct the word you then get a completely misspelled word, if that makes any sense.
Wšě wotmołwy (1)
Do you have a dictionary installed and selected?
You can see which dictionary is selected if you right-click in a text area and open the Languages submenu.
- Open the "Add Dictionaries" link to install a dictionary if you do not have one.
- Make sure that [X] "Check Spelling" in the right-click context menu is check-marked.
You can enable or disable spell checking globally:
- Tools > Options > Advanced : General: Browsing: "Check my spelling as I type"
You can look here for dictionaries:
If this didn't help then check for problems caused by extensions.
See:
Wot cor-el