**Affected versions** * 81.0a1 (BuildId:20200804215246) **Unaffected versions** * 80.0b3 (BuildId:20200803045446) * 79.0 (BuildId:20200720193547) * 78.1.0esr (BuildId:20200722151235) * 68.11.0esr (BuildId:20200720181548) **Affected platforms** * Windows 10 64bit **Unaffected platforms** * macOS 10.14 **Steps to reproduce** 1. Launch Firefox. 2. Access the following [link](https://www.youtube.com/watch?v=xCW_hEMEwL8) or access any youtube video. 3. Maximize the browser window. 4. Enter in theater mode and play the video. 5. Scroll down and up. **Expected result** * No UI issues are encountered. **Actual result** * A flicker can be observed at the top portion of the masthead. **Regression Range** This seems to be a regression: * Pushlog: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=4ed6ec0c8220321b13c108ffaa7ab6cfc8d7698f&tochange=4558b3cfd6fe49647780a0ec86dfa97f0dd3adcb * Potential regressor: Bug 1653409 **Notes** * For further information regarding this issue please access the following [link](https://drive.google.com/file/d/1w92d9JuHJSf8ZwqUiya7K4M2CGvqLbVD/view?usp=sharing) to see the screenshot. * [Suggested Severity] Since this is a cosmetic issue I think that marking this as an S4 issue fits here.
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**Affected versions** * 81.0a1 (BuildId:20200804215246) **Unaffected versions** * 80.0b3 (BuildId:20200803045446) * 79.0 (BuildId:20200720193547) * 78.1.0esr (BuildId:20200722151235) * 68.11.0esr (BuildId:20200720181548) **Affected platforms** * Windows 10 64bit **Unaffected platforms** * macOS 10.14 * Ubuntu 18.04 64bit. **Steps to reproduce** 1. Launch Firefox. 2. Access the following [link](https://www.youtube.com/watch?v=xCW_hEMEwL8) or access any youtube video. 3. Maximize the browser window. 4. Enter in theater mode and play the video. 5. Scroll down and up. **Expected result** * No UI issues are encountered. **Actual result** * A flicker can be observed at the top portion of the masthead. **Regression Range** This seems to be a regression: * Pushlog: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=4ed6ec0c8220321b13c108ffaa7ab6cfc8d7698f&tochange=4558b3cfd6fe49647780a0ec86dfa97f0dd3adcb * Potential regressor: Bug 1653409 **Notes** * For further information regarding this issue please access the following [link](https://drive.google.com/file/d/1w92d9JuHJSf8ZwqUiya7K4M2CGvqLbVD/view?usp=sharing) to see the screenshot. * [Suggested Severity] Since this is a cosmetic issue I think that marking this as an S4 issue fits here.