Blocks "seen" marks on Facebook Messenger and Instagram Stories.
No Seen Extension
You can configure No Seen to be enabled only for the websites you want by going to the add-ons \"Preferences\".
Source Manifest.json
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User reviews
Bee Ivey (ID: 0000001448f5ea4d) Voted 1 ★ - Updated 05/05/2022
Peny Sadly (ID: 000000444ba7ba57) Voted 4 ★ - Updated 06/24/2020