I'm getting the following error in Firefox when I open /graphiql. I'm using Firefox version 52.5.3 (64-bit). I don't get that error in Chrome and Safari.

Anyone here who can help me to fix that?
Hi!
I'm facing this issue too, only on Firefox (Quantum 60.0.1 (64 bits)).
Do you have a sample repo that demonstrates this bug?
It's not a bug, it's a feature ;-)
See here for a fix: https://stackoverflow.com/a/12042843
this helps me so much as a user https://stackoverflow.com/a/63831245/14579016
Most helpful comment
It's not a bug, it's a feature ;-)
See here for a fix: https://stackoverflow.com/a/12042843