Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
In such cases, you may want to consider using a separate browser specifically for those sites or enabling Flash Player only when necessary, while keeping it disabled by default.
Source: https://www.devicemag.com/what-is-adobe-flash-player-used-for-on-mac/