Of all the add-ons this is one my favorites, is very intuitive and user friendly, don't need a manual to figure it out.

As hinted at the plugin description some website developer knowledge is needed to dynamically add the 'download' attribute to anchor tags.

Open up the browser console and enter:

$$('a[href*=".webm"]').forEach(s => s.setAttribute('download', s.getAttribute('href')))

Above command line will:
- find all anchor tags on a website which contain the '.webm' extension in their 'href' attribute
- then iterate over found anchor tags
- and set the 'download' attribute to each anchor using the value from the 'href' attribute

This makes the toolbar button appear everyone was searching for.
Adjust code to your needs.

Très pratique. J'utilise un userscript pour ajouter l'attribut "download" sur les lien d'une certaine page et je peut tout récupérer