I used to work on Chrome but I am considering to switch to Safari entirely due to the horrible battery efficiency of Chrome. I noticed when opening PDF files, the titles of tabs all appeared as links which unfortunately means I can't see any difference between them:
Here you can see 1 website and 4 PDFs opened from it with these horrible url titles that make it difficult to know which is which.
Here's how it looks on Chrome:
Safari browser on Macbook Pro 2017