

toolbarButton-pageDown-icon: url(images/toolbarButton-pageDown-dark.svg) toolbarButton-pageUp-icon: url(images/toolbarButton-pageUp-dark.svg) toolbarButton-secondaryToolbarToggle-icon: url(images/toolbarButton-secondaryToolbarToggle-dark.svg) toolbarButton-sidebarToggle-icon: url(images/toolbarButton-sidebarToggle-dark.svg) toolbarButton-menuArrow-icon: url(images/toolbarButton-menuArrow-dark.svg) treeitem-collapsed-icon: url(images/treeitem-collapsed-dark.svg)

treeitem-expanded-icon: url(images/treeitem-expanded-dark.svg) loading-icon: url(images/loading-dark.svg)

Line 456, the lines (prefers-color-scheme: dark)
#Dark reader for firefox pdf#
(A) Select and copy the following style rule code (Updated using code from #answer-1353546) /*** Firefox 81 PDF Viewer Dark Theme for userContent.css ***/ If you do already have a working userContent.css file, you just need to add the rule under (A) to your file. This assumes you do not already have a userContent.css file. Setting this up is a little bit involved, so please set aside 10 quiet minutes to work through it. If that's new to you, here are the steps. Yes, you can create a userContent.css file.
