added some content to tuto computer

tutos/computer.txt

@@ -2,3 +2,18 @@
 	**sudo xinput --list** list all input
 	**xinput disable 12** disable the input 12, touchscreen for Lenovo-FLEX-3-1120
 	**load to start :** add "xinput disable 12" in application autostart
+
+**appimage :**
+	**chmod +x <name>.appimage** make it executable
+	**sudo vim /usr/share/applications/<name>.desktop** create a file.desktop with content :
+		[Desktop Entry]
+		Exec=/absolute/path/to/file/<name>.AppImage
+		Name=<name>
+		Type=Application
+	**( cd /usr/share/applications && chmod 644 <name>.desktop )** maybe change permissions
+
+**firefox extension source code**
+	**right click on install** and select "copy link"
+	**curl -L <link> > /tmp/myextension.xpi** download the extension with curl inside a tmp file
+	**unzip /tmp/myextension.xpi -d /tmp/myextension** unzip the content
+	enjoy reading it ;)