Thanks so much for letting us know about this! Do you have any idea if there are particular circumstances that trigger this behaviour? We haven’t seen it ourselves, but any further context you can provide would be helpful in narrowing down the issue.
Thanks for the update! Do you see any errors on the Javascript console in Firefox when this happens? That would be particularly helpful in narrowing down the issue!
I would run the app in another tab, then I go back to the Anvil IDE tab (design) to try and modify a component (same form usually). Then it locks up (It does not happen always).
I have attached the JavaScript console error report below.
Do you have any browser extensions installed? Those errors are definitely not coming from Anvil, and that source code doesn’t belong to either the Editor or your app!