Description from extension meta
The extension collapses all posts you have viewed in a common list. Speed up viewing new posts and do not waste time on old ones!
Image from store
![Reddit: collapse viewed [P]osts](https://lh3.googleusercontent.com/dhKIIGPqboC_mYPut1EMWACRCzNlbuWdNAhDWbhsYlBICi68deoF57MX_BcuaakimnvxhYRAjw=w640-h400-e365-rj-sc0x00ffffff)
Description from store
The extension collapses all posts you have viewed in a common list.
Speed up viewing new posts and do not waste time on old ones!