Affected versions

• 86.0a1(2020-01-06), 85.0b4, 84.0.2, 78.6.0esr;

Affected platforms

• macOS 11.0.1, macOS 10.15;

Steps to reproduce

1. Launch Firefox, access https://powerplatform.microsoft.com/en-us/
2. Click on any of the Products, Capabilities, Solutions, Learn, Community button-option;
3. Click on another button-option from the above mentioned ones.

Expected result

• dropdown menu from step 2 closes, dropdown from step 3 opens;

Actual result

• both dropdowns from step 2 and 3 are open;

Regression range

• not a regression, reproducible on older builds from 2015;

Additional notes

• attached recording to illustrate the issue;
• component might need to be changed to a more appropriate one;
• set S3 as severity due to issue while being annoying not fully blocking the usage of the site.