update firefox tab bar hiding method

README.md

@@ -11,17 +11,8 @@ layout.css.backdrop-filter.enabled
 svg.context-properties.content.enabled
 ```
 2. Close Firefox.
-3. Create the file `<firefox profile>/chrome/userChrome.css` in the Firefox
-   profile directory (there may be multiple directories, one will only have one
-   file called `times.json`, this is the wrong one, choose the other one):
-    - Windows: `%AppData%/Mozilla/Firefox/Profiles`
-    - Linux: `~/.mozilla/firefox`
+3. Set up https://github.com/MrOtherGuy/firefox-csshacks (git method) and add
+   this to userChrome.css:
 ```
-#TabsToolbar
-{
-        visibility: collapse;
-}
+@import url(chrome/hide_tabs_toolbar_v2.css)
 ```
-4. Open Firefox and confirm the top bar is gone. To enable the title bar, go to
-   `Menu -> More Tools -> Customize toolbar...` and check "Title Bar" in the
-   bottom-left corner.