Download/Clone the project and unzip the files.
Navigate to the root of the directory/folder containing all the unzipped files and remember/copy the path to the folder.
Start Chrome and enter the following without quotes in the address bar : "chrome://extensions".
Toggle "Developer mode" if not already on.
Click on the "Load unpacked" button and navigate to the folder that contains all the unzipped files or alternatively just paste the path of the folder if you had copied it in previous steps into the address bar of the file explorer.
Click on "Select Folder" or "Open".
Now the plugin should be visible in the current chrome tab you are in.
You can toggle the "Developer mode" off if you want to.
That's it. Enjoy random Quora links without having to log in/sign up.