Frustration with this add-on is constant as it labels words like 'unvetted' as wrongly spelling and has to be added.
In fact an unrealistic number of common everyday words have been displayed as miss spelt suggesting that they have never been added to the dictionary.

Literally created a Firefox account to warn everyone off this dictionary. It does not work.

Words like "wanker", a typical Australianism, (and Australianism it seems) are missing.

Basic words from universal English are missing. It's just garbage, and the only improvement would be to find a new dictionary

I used to be annoyed by the default US dictionary red-lining words with Australian spelling. Now I can be annoyed by this dictionary red-lining just about every word I type.

Examples of "wrong" words include:
adults
including
trams
speeds
required
points
seating
driver
months

It seems many plurals and completely normal and common conjugations get red-lined, making this dictionary sub-standard and actually pretty pointless.

I'm turning spell check off altogether. Better to have none than one that's consistently wrong.

I don't know how this extension exists in its current state - sure, you got rid of annoying US spelling versions of words, only to be replaced with a bucket load of other ones in their place! I'm seriously getting red lined for the following words: it's, goodness, days, thanks, games, wanting, yours, honestly, exactly, exists, annoying, versions, words, seriously, getting, following, words. How is this happening?