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+## Manual installation from a system installed package
+
+1. Menu > Help > More Troubleshooting Information.
+
+2. Application Basics > Profile Directory > Open Directory.
+
+3. Open directory in a terminal.
+
+4. Create a `chrome` directory if it doesn't exist:
+
+	```
+	mkdir -p chrome
+	cd chrome
+	```
+
+5. create a symlink to the actual theme location:
+
+	```
+	ln -s /usr/lib/thunderbird-gnome-theme thunderbird-gnome-theme
+	```
+
+6. Create single-line user CSS files if non-existent or empty (at least one line is needed for `sed`):
+
+	```
+	[[ -s userChrome.css ]] || echo >> userChrome.css
+	[[ -s userContent.css ]] || echo >> userContent.css
+	```
+
+7. Import this theme at the beginning of the CSS files (all `@import`s must come before any existing `@namespace` declarations):
+
+	```
+	sed -i '1s/^/@import "thunderbird-gnome-theme\/userChrome.css";\n/' userChrome.css
+	sed -i '1s/^/@import "thunderbird-gnome-theme\/userContent.css";\n/' userContent.css
+	```
+
+8. Symlink preferences file:
+
+	```
+	cd .. # Go back to the profile directory
+	ln -fs chrome/thunderbird-gnome-theme/configuration/user.js user.js
+	```
+
+9. Restart Firefox.
+
+10. Open Firefox customization panel and move the new tab button to headerbar.
+
+Done. See README.md for more details.