2. Open chrome and goto "More tools > Extensions".
3. Choose the "Load Unpacked" option on the toolbar above.
4. Navigate to the folder where you've cloned the repo and click select.
5. The extension is now added.
Simply select the text you'd like to refer and click on "refR this!". A side pane will be opened where the text is seen. Same can be done for an image.
This mode of refering will work for any "selectable" text/image on anything opened using a browser (not necessarily webpage).
The text/image that was refererd previously will be listed in the refR pane even after re-opening the browser. This is because the data is stored in the local storage of the browser.Have fun reading!