Sometimes I find myself with long lived tabs and I don’t always remember how I wound up on some of those pages.
Here’s a neat little trick I discovered today while trying to find out if I should share an article with someone or if they already shared it with me.
First things first, open dev-tools
Then go to the network panel 
Now refresh the page and scroll to the top of the list of resources and click the top one 
Under the referer request header you should see how you wound up on that page.