It's probably too late for Firefox 87, but I suggest to consider this bugfix as a ride-along if there will be a Firefox 87.0.1. Bug 1686310 caused serious visual regressions. It affects all forms in every forum that uses a software called WBB in versions 4.0 or 4.1. I don't know the international forum software market but in Germany it's a very popular software that is used by hundreds if not thousands websites. Version 4.x already reached EOL and I don't know how common these versions still are but I already found four affected forums, it was also already reported in the German Firefox support forum and there won't be an update by the vendor of the forum software due to the EOL.
Bug 1694729 Comment 21 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
It's probably too late for Firefox 87, but I suggest to consider this bugfix as a ride-along if there will be a Firefox 87.0.1. Bug 1686310 caused serious visual regressions. It affects all forms in every forum that uses a software called WBB in versions 4.0 or 4.1. I don't know the international forum software market but in Germany it's a very popular software that is used by hundreds if not thousands websites. Version 4.x already reached EOL and I don't know how common these versions still are but I already found four affected forums, it was also already reported in the German Firefox support forum and there won't be an update by the vendor of the forum software due to the EOL (newer versions are not affected).