firefox-useragentswitcher software package provides virtual package provided by xul-ext-useragentswitcher, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install firefox-useragentswitcher
firefox-useragentswitcher is installed in your system.
Make ensure the firefox-useragentswitcher package were installed using the commands given below,
$ sudo dpkg-query -l | grep firefox-useragentswitcher*
You will get with firefox-useragentswitcher package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Virtual packages |
| Package | firefox-useragentswitcher |
| Version | |
| Description | virtual package provided by xul-ext-useragentswitcher |
| Sub Section | Virtual |
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