Flashing of matrix row and column headers in Firef...

I have a couple matrices in my report, and randomly when I mouse over certain pixes in the middle of a matrix, it highlights some or all of the row and column headers of the matrix, or even another matrix on the same page. As I move the cursor around, this highlightnig and unhighlighting happens very fast, so it's unpleasant flickering, rather than just looking bad with some highlights. For example, here's a partial highlight of the row headers that I was able to catch in a screenshot (text removed) when my cursor was on a particular pixel in a 0 cell.

Is this a known bug with PowerBI and Firefox? Is there a fix (even if it's something like "don't use (conditionally) highlighted cells in your matrix")?

Thanks for any help or redirection.