Recently I noticed that occasoinally if I try to load a new page on a new tab it will not render. Sometimes it helps if I close it from the recent apps and reload Firefox. Last ti.e it didn't helped. This time what was interesting I tried to switch to a not yet loaded page, it was also black. Than I switched to a page with a preloaded preview it flickered for a bit and than the issue resolved itself. The affected device is a newly installed s24 with exynos s2400 so I'm not sure if it's a driver issue or is it a firefox bug. I didn't notice any similar with other apps.