Weird, I thought Fennec had those. I downloaded it and use it for browsing, but I mostly don't browse on my phone. From a web search though, I found out you ca

Weird, I thought Fennec had those. I downloaded it and use it for browsing, but I mostly don't browse on my phone. From a web search though, I found out you can go into settings, click on "About Fennec" and click on the logo five times to unlock debug mode which apparently gives you access to custom add-on collections. You have to go to the firefox add-ons page and make a custom collection under your account for it to be useful. This presumably allows all add-ons through this method.