This repository was archived by the owner on Jul 21, 2021. It is now read-only.

Description
When page contains too many blocked elements, my browser (Firefox ESR 38 on Linux) becomes extremely slow (each frame takes seconds to draw). It seems to be the result of combining linear-gradient and background-repeat in extensions.umatrix.placeholderBackground. Replacing the gradient with a data-uri-encoded png fixes the issue for me. Using -moz-repeated-linear-gradient instead of repeating the gradient with background-repeat works as well.