Keyboard shortcut "ctrl+f" doesn't move the cursor to the search box.

With this plugin disabled, "ctrl+f" moves the cursor to the search box. With it enabled, this functionality no longer works.

Expected:
When pressing "ctrl+f", the cursor should move to the search box.

Actual:
Nothing happens.

$ lsb_release -rd
Description: Ubuntu 18.04.1 LTS
Release: 18.04

$ apt-cache policy rhythmbox-plugin-alternative-toolbar
rhythmbox-plugin-alternative-toolbar:
  Installed: 0.18.0-1
  Candidate: 0.18.0-1
  Version table:
 *** 0.18.0-1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu bionic/main i386 Packages
        100 /var/lib/dpkg/status

$ apt-cache policy rhythmbox
rhythmbox:
  Installed: 3.4.2-4ubuntu1
  Candidate: 3.4.2-4ubuntu1
  Version table:
 *** 3.4.2-4ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status