Sure, shmu!Every additional extension that you install is another extension that can get hacked and receive malicious updates, or be sold to an unscrupulous party. Since these things can and do happen, it's best to keep it down to a minimum, in order to reduce risks.
You know a lot more about these extensions than I do. If it's good enough for you, it's good enough for me.Sure, shmu!
But for reduce risks, I chose rather only from developers who are still very much alive, who have trustworthy websites.
Eg developer of this add-on above, Andras Horvath, it has the trustworthy website, I posted the link too, here too:
user info: User Info for Andras Horvath :: Add-ons for Firefox
- and homepage of developer: on frontfoo.com: frontfoo.com
I hope you have nothing against Hungarians and their add-ons? Which are offered to us for free...
Shmu, if you have seen an extension that I've posted, that you don't consider trustworthy, quickly give us the sign, so that we can also judge again...
Because first - I tried all the extensions/add-ons I posted the links, I have pure conscience.