Facebook is sometimes very interesting place to talk with friends, share photos, videos, etc but when you are busy or in a hurry, you just wants to check out the assignment questions that your classmate send you then if somebody starts chatting with you then it is really very much frustrating.
Earlier, on Facebook, you could avoid this by not replying the buddy who send you message. He was not able to know whether you’ve read his message of not. But now, as Facebook added read receipt feature to Facebook Chats and Message Box you can’t do this trick too.
Read receipt will let the sender know whether you’ve read his message or not. So your can’t trick them by available default settings on Facebook. However, there is a simple workaround that lets you to remove that “Read Receipt” from Facebook.
You just need to install Chat Undetected Plugin on your browser. Follow these steps:
Step 1 : Go To This Website.
Step 2 : Click on large green button, saying “Get Chat Undetected”.
Step 3 : It will download Chat Undetected Software to your PC that will add Chat Undetected Extension/Add-ons to your Web Browsers.
Step 4 : Close All the opened browser and Install the setup file i.e., chat-undetected.exe.
Step 5 : Open your browsers, on extensions section, you   will find the extension installed. Activate It and you’re done.
If you are using Mozilla Firefox then it will ask for your permission to install and activate chat undetected add-on. Just click on Install Now button there.
Now, whenever you read somebody’s message, he/she will not get read receipt.

Disabling/Un-installing Chat Undetected

If you wants to disable this feature, just deactivate the extension from your browser.
For Chrome, Go to Settings > Extensions, uncheck “enable” checkbox. There is also option (dustbin icon) to delete the extension to remove Chat Undetected Plugin from Chrome.
If you are using Mozilla FireFox, Go to Tools > Add-On or simply pressCtrl+Shift+A, disable the plugin and restart your browser. You can also delete the plugin for Mozilla FireFox specifically from here.