Legacy Scroll Bar
Scroll bars with no cursor are difficult to use on desktops. They do not display the size of the window relative to the size of the page yet clicks make pages jump to that proportional location. The slow scroll feature is reduced to two tiny lines at the end of each scroll bar.
I found no way to revert to the legacy scroll bars, featuring a cursor proportional to the size of the window relative to the size of the page, and allowing for slow scroll by dragging the cursor.
Reverting to legacy controls is standard feature when innovative solutions are implemented.
선택된 해결법
Changing the computer wide graphical theme solved this issue.
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Changing the layout.css.scrollbar-width.enabled preference and layout.css.scrollbar-color.enabled preference to false from the Firefox about:config page will replace custom scrollbars with the default scrollbars for your OS. You will need to restart Firefox to see any changes.
Any changes beyond that will likely require you to make modifications to your OS, which are probably outside the scope of this forum.
Hope this helps.
글쓴이 Wesley Branton 수정일시
선택된 해결법
Changing the computer wide graphical theme solved this issue.