It would have been helpful to have quoted the sentence you did not understand as I cannot be sure that I now see the same thing you did. However, in case we are

It would have been helpful to have quoted the sentence you did not understand as I cannot be sure that I now see the same thing you did. However, in case we are seeing the same thing I’ll reword the following sentence for you: > By that definition it’s your PWA not planning on supporting Firefox. The above could also be written: > Under the assumption that a PWA is defined as a website which queries the browser to discover additional functionality, and then goes on to use features it discovers, it is the PWA which doesn’t support a particular browser. Specifically, the PWA likely depends on functionality which may not always be present, which means it it not progressively enhanced. Apologies if my rewording comes across condescending. I have no information about your level of knowledge on the subject and chose not to omit anything on purpose.