Betaflight web configurator navigation buttons don't work

[pfiporlos]

Description of the issue:
Betaflight web configurator starts misbehaving the moment I press connect on the page with my flight controller connected.

Apparent error in console when pressing “connect” button:

setup-syzTyQAN.js:5 Uncaught TypeError: Cannot read properties of undefined (reading 'effectiveType')
    at pe (setup-syzTyQAN.js:5:764)
    at HTMLDivElement.L (setup-syzTyQAN.js:5:1327)
    at HTMLDivElement.<anonymous> (DarkTheme-CGZGbnbi.js:16:11455)
    at x.each (DarkTheme-CGZGbnbi.js:13:2923)
    at x.fn.init.each (DarkTheme-CGZGbnbi.js:13:1393)
    at Object.<anonymous> (DarkTheme-CGZGbnbi.js:16:11437)
    at W (DarkTheme-CGZGbnbi.js:13:29847)
    at Object.fireWith [as resolveWith] (DarkTheme-CGZGbnbi.js:13:30641)
    at ii (DarkTheme-CGZGbnbi.js:16:6054)
    at XMLHttpRequest.<anonymous> (DarkTheme-CGZGbnbi.js:16:8535)

Exact URL of the website in question:

Betaflight

Did the issue present with default Shields settings? (yes/no)
Yes
Does the site function as expected when Shields are turned off?
No
Is there a specific Shields configuration that causes the site to break? If so, tell us that configuration. (yes/no):
No
Does the site work as expected when using Chrome?
Yes
Brave version (check About Brave):
Brave 1.79.123