Test steps * Navigate to https://httpbin.org/anything/chunter/67d3af89f796929c470ad5cd%7Cchunter%3Aclass%3AChannel?message= * Click ⋮/Bookmarks/Add * Click Edit in a popup Expected result Bookmark editing dialog like for any other bookmark Actual result Blank screen. Tried on multiple devices. Firefox Nightly for Developers for Android 138.0a1 (Build #2016079719), hg-0bc4d1520de1+ GV: 138.0a1-20250317094831 AS: 138.20250311050358 and 138.0a1 (Build #2016080007), hg-42a230677167+ GV: 138.0a1-20250318213234 AS: 138.20250311050358 Reported as https://bugzilla.mozilla.org/show_bug.cgi?id=1955223