How to install add-ons on Mozilla Firefox
For you to install add-ons on Mozilla Firefox, you need to have that browser. Visit this link. It's around 12 mb only. After downloading, install this into your system before downloading the add-ons.
How to install add-ons on Mozilla Firefox
By the way, is there a particular site wherein you can download the add-ons for Mozilla?
How to install add-ons on Mozilla Firefox
I guess there are blog sites and other downloading sites which provide links for different add ons, you may try visiting this one https://blog.mozilla.org/labs/
How to install add-ons on Mozilla Firefox
I highly recommend that you download this in the Mozilla site. For the installation, just open your browser and click on tools. After that, choose the add-ons and then drag the downloaded add-ons to the add-ons manager. A message will appear, just click ok. Restart your Mozilla for the add-on to work. Hope this helps.