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Extensions 
Chrome
Web store Download Facebook Unseen Chat chrome extension. This extension lets you disable facebooks mark as read feature and install in your Google chrome browser. This is Direct Facebook Unseen Chat Crx download for Chrome it is also called Facebook Unseen Chat offline CRX for chrome Download. This Facebook Unseen Chat is used to This extension lets you disable facebooks mark as read feature
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Hides the ”Seen” feature from Facebook™ chat and Messenger of your friends. Blocks Delivery receipts...
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Blocking sending "seen"(Unseen message) and typing features in Facebook/Messenger
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Show notifications from websites in the favicon.
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Enlarges the size of the chat window for Facebook messages.
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Provides useful utilities for users of social networks: Facebook, Messenger, Instagram, Reddit...
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Block Seen feature on Facebook Messages.
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Facebook without setting off seen notifications
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Provide additional features for YDPage App
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A screen reader emulator that helps you understand how blind people use the web
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This extension hides everything on Facebook except for chat