firefox-esr-dev software package provides Development files for the Gecko engine library, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install firefox-esr-dev
firefox-esr-dev is installed in your system.
Make ensure the firefox-esr-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep firefox-esr-dev *
You will get with firefox-esr-dev package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Library development |
| Package | firefox-esr-dev |
| Version | 45.4.0esr-1~deb7u2 |
| Description | Development files for the Gecko engine library |
| Sub Section | libdevel |
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