**Environment:** Operating system: Android 11 Firefox version: Firefox Mobile 132.0/130 **Preconditions:** - dark theme enabled (it reproduces with light theme as well but its barely noticeable) - "Scroll to hide toolbar" enabled **Steps to reproduce:** 1. Go to https://www.capcut.com/ro-ro/ 2. Dismiss the cookie banner. 3. Scroll up/down fast. 4. Observe the toolbar. **Expected Behavior:** There's no trail left behind when toolbar hides. **Actual Behavior:** Toolbar leaves a white trail when it hides. **Notes:** - Doesn't seem to reproduce on other websites - Reproduces regardless of the status of ETP - Reproduces in Firefox Nightly, and Firefox Release - Does not reproduce in Chrome Created from https://github.com/webcompat/web-bugs/issues/141969
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**Environment:** Operating system: Android 11 Firefox version: Firefox Mobile 132.0/130 **Preconditions:** - dark theme enabled (it reproduces with light theme as well but its barely noticeable) - "Scroll to hide toolbar" enabled **Steps to reproduce:** 1. Go to https://www.capcut.com/ro-ro/ 2. Dismiss the cookie banner. 3. Scroll up/down fast. 4. Observe the toolbar. **Expected Behavior:** There's no trail left behind when toolbar hides. **Actual Behavior:** Toolbar leaves a white trail for a very short duration when it hides. **Notes:** - Doesn't seem to reproduce on other websites - Reproduces regardless of the status of ETP - Reproduces in Firefox Nightly, and Firefox Release - Does not reproduce in Chrome Created from https://github.com/webcompat/web-bugs/issues/141969