字体真棒图标在Firefox中排列错误

Applied the FontAwesome icon "caret-right" to three li-/a-tags in my menu, to indicate the presence of submenus. The icons shall be right-aligned. My code works in Chrome and Edge, but doesn't in Firefox. Read about a possible problem with loading the FA files via CDN, so I switched to loading them from my webspace, with no success. I can see the icons at the end of the menu items, but they are cut off and pushed down. Here's my HTML and CSS:Applied the FontAwesome icon "caret-right" to t