Update README.md

README.md

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 <h1 align=center><img src="icon48.png" alt="logo" /> New Tab Notes</h1>
 
-<!-- <p align=center>
-<img alt="Mozilla Add-on" src="https://img.shields.io/amo/v/%7B3eacef21-a96d-4adb-942e-c4eb162bf00c%7D">
-<img src="https://img.shields.io/amo/rating/%7B3eacef21-a96d-4adb-942e-c4eb162bf00c%7D" />
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-<img src="https://img.shields.io/github/license/semanticdata/firefox-new-tab-notes" />
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+<p align=center>
+<img alt="Mozilla Add-on" src="https://img.shields.io/amo/v/newtab-notes@semanticdata">
+<img src="https://img.shields.io/amo/rating/newtab-notes@semanticdata" />
+<img src="https://img.shields.io/amo/dw/newtab-notes@semanticdata" />
+<img src="https://img.shields.io/amo/users/newtab-notes@semanticdata" />
+<!-- <img src="https://img.shields.io/github/license/semanticdata/firefox-new-tab-notes" /> -->
+</p>
 
 A Firefox extension for simple notetaking in Firefox's New Tab.
 
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 ## Acknowledgments
 
+This extension is based on [Tab Notes](https://github.com/nsht/tab_notes) which hasn't received an update in 4 years.
+
 Icons used for all my extensions are part of <a href="https://uxwing.com/">UXWing</a>'s collection. Take a look at their <a href="https://uxwing.com/license">license</a>.
 
 ## License