For some languages, friendly-snippets provide multiple snippet files. This is for instance the case of markdown, where snippets are loaded from global.json, markdown.json and vscode-jekyll-snippets.json.
I do not know if it would be possible, but it would be nice if we could explicitly include or exclude some snippets file from friendly-snippets. I think this could be done either by providing a custom package.json that would replace the default one provided by friendly-snippet or provide an option to list specific snippets to exclude.
In my specific case, I would like to exclude vscode-jekyll-snippets.json as I do not have any use for them.