>>105698822
It's not ruined.
If you want to remove that button, just do the following:

1) Go to about:config and set toolkit.legacyUserProfileCustomizations.stylesheets to True.
2) Go go to about:support, scroll down to "Profile Folder" and click Open Folder.
3) create a folder called "chrome" in your profile folder.
4) inside the chrome folder, create a file called userChrome.css
5) edit the file with the following content:
#urlbar-searchmode-switcher {
visibility: hidden;
/* display: none; */
}

6) Restart Firefox.