geany-plugin-webhelper software package provides web helper plugin for Geany, 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 geany-plugin-webhelper
geany-plugin-webhelper is installed in your system.
Make ensure the geany-plugin-webhelper package were installed using the commands given below,
$ sudo dpkg-query -l | grep geany-plugin-webhelper *
You will get with geany-plugin-webhelper package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Development |
| Package | geany-plugin-webhelper |
| Version | 1.28+dfsg-1 |
| Description | web helper plugin for Geany |
| Sub Section | devel |