I don't know if it helps, but it seems an error...
I think it can be the extra comma in this rule:
treechildren::-moz-tree-cell-text,(selected) { color: #FFFFFF !important; }
Try removing that comma as this:
treechildren::-moz-tree-cell-text(selected) { color: #FFFFFF !important; }
OFF-TOPIC: You can use HTML or Markdown language to post your code. IMO, I think its is better to separate the request text from the source text. Markdown is easy; to create a source code block you only need to write a line starting with ``` (three backtick quotes) at the begining and at the end of the code.
Lorem Ipsum text
element { color: #FFFFFF; }
#selectorId { color: #000000; }
.selectorClass { color: #FFFFFF !important; }
removing the coma, didn't bring back the "white" selected text..
treechildren::-moz-tree-cell-text(selected) { color: #FFFFFF !important; }
I don't know in which site i could have a fix for that anymore, i asked it in several places
I have a userstyle for the history sidebar, that works the way i want it..
but for all other windows like the library window (all history/organize bookmarks)
or even sessions saver's recovering prompt or adblock open blockable items & other similar windows,
i have a second paragraph that contains a general style, but selected text should appear in white,
& i actually doesn't .. . i don't know what to do anymore:
#bookmarks-view, #historyTree { background-color: #FFFFFF !important; }
#bookmarks-view, #historyTree treechildren::-moz-tree-cell-text { color: #020944 !important; }
#bookmarks-view, #historyTree treechildren::-moz-tree-cell-text(selected) { color: #FFFFFF !important; }
#bookmarks-view, #historyTree treechildren::-moz-tree-row(selected) { background: #0080FF !important; }
#bookmarks-view, #historyTree treechildren::-moz-tree-row(focus, selected, current),
#bookmarks-view, #historyTree treechildren::-moz-tree-row(focus, selected, odd),
#bookmarks-view, #historyTree treechildren::-moz-tree-row(focus, selected, even)
#bookmarks-view, #historyTree treechildren::-moz-tree-row { background: #0080FF !important; }
#bookmarks-view, #historyTree treechildren::-moz-tree-image { width: 0 !important; }
.tree-bodybox { background-color: #FFFFFF !important; }
treechildren::-moz-tree-cell-text,(selected) { color: #FFFFFF !important; }
treechildren::-moz-tree-cell-text { color: #020944 !important; }
treechildren::-moz-tree-row(selected) { background-color: #2673c1 !important; }