Note

• Found while verifying bug 1767053.

** Found-in version**

• Firefox 102 beta 5

Affected versions

• Firefox 102 beta 5
• Nightly 103.0a1 2022-06-08

Affected platforms

• Mac OSX 12.3

Steps to reproduce

1. Open new profile.
2. Open about:telemetry
3. Left bottom corner, press Raw Json - data:application/json opens in a new tab
4. Open the address bar panel (mouse click or Cmd+L) and press Right key

Expected result

• Cursor is placed at the end of address bar string, raw json's address is visible

Actual result

• Raw json's address is blanked out, the cursor is blinking on the right side of an empty urlbar. Pressing the Escape key twice will reach to this state.

Regression range

• Not a regression, this is a follow-up from bug 1767053.

Additional notes

• Windows 10 and Ubuntu are not affected.

I tested this locally and got a data URI that was 1450385 characters long, so we think this is something to do with the editor component not displaying it correctly.