Google’s PageSpeed Insights tester throws this error in Brave Browser (but in no other browsers!) when any URL is submitted for testing (and the test cannot begin as a result):
The referrer https://www.googleapis.com/ does not match the referrer restrictions configured on your API key. Please use the API Console to update your key restrictions.
At first, I thought this was a problem with my site, which has never received that error message when submitted to PageSpeed Insights. So, I ran PageSpeed Insights back on Chrome and Firefox, and it worked as it always does. I then Googled the error message and found that others had received the error when running the tester on Brave. So, it seems to be browser-specific. Could you please look into this? Developers use PageSpeed Insights a lot to test the integrity of their sites, and they apparently may not use it on Brave.