Could you please provide an example link that demonstrates the problem?

The bug was discovered in extension. 
The code similar to provided below was not working fine when opening 10-15 tabs almost in the same time. On few tabs font was not loaded.
`const fontUrl = "https://fonts.gstatic.com/s/mali/v1/N0ba2SRONuN4SC3EDw.woff2";
 const fontFace = new FontFace(
   "TestFont",
   `url('${fontUrl}')`,
   { style: "normal", weight: "normal" }
 );
 fontFace.load().then((ff) => {
   document.fonts.add(ff);
   console.log("FontFace loaded.", ff);
 }).catch((error) => {
   console.log("Cannot load font.", error);
 });
`
When moving `document.fonts.add(ff);` out from promise, just before it, font starts loading on all tabs. But still no logs in console for few tabs.   

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

volodymyr.rozhnov@ - Thanks for filing the issue and providing the extension code at comment #2. But it won't be possible from our end to triage the issue until a zip extension file is provided. Hence, requesting you to please provide a sample extension file to test the issue from TE-end.

Thanks...!!