a little CSS to make a sidebar for you :3
Download userChrome.css
Go to about:config and mark toolkit.legacyUserProfileCustomizations.stylesheets to true to enable CSS customization
Install Sidebery to your browser
Open about:profiles and open the file marked as This is the profile in use and cannot be deleted.
Create a folder named chrome
Copy & Paste userChrome.css to the chrome folder
If you do all the steps, restart your browser and enjoy!