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Hello Safari 15.4 window.open freezes both parent and child tabs Made a github page where you can reproduce the bug: https://swanty.github.io/pdfjs-safari/broken.html It happens only when special conditions are met: The broken.html page loads Stripe v3 js file (important for the freeze) Upon clicking CLICK ME the code executes window.open().location = '...';, thus both parent and child tabs are linked together in the same process The second page opens the latest release of mozilla pdf.js that loads .pdf that contains only 1 image (the image is important for the freeze) Image is simply 3000x3000 PNG, 1 color, 1.2 kB file created with photopea, nothing special, except the resolution. PDF I created by dragging the .png into Chrome and clicking Print -> Save as pdf, also nothing special, just a regular pdf. On our production web if I navigate pages in same tab and at any point that stripe JS is loaded and then I navigate to a different page where window.open().location = '...' opens that pdf.js + .pdf file with special image then both tabs freeze. It doesn't matter how many times I navigate the pages (in same tab), it seems that once the stripe js is loaded, it lingers in the tab memory somewhere and causes the freeze. I would really appreciate it if someone from the Safari developer team could take a look at this and help find a solution :) Thank you