Hello, we're sorry that this addon does not suit you but brace yourself, another addon is coming!
And even better, there it is : https://addons.mozilla.org/fr/firefox/addon/qwant-com/
This second addon, also handcrafted by our developers does not change your homepage and only sets Qwant as your default search engine.
As for the website, could you please give us some information on what is slow? Is it the overall loading, the results?
Thank you a lot for your feedback!