Oh no, it is a web app (essentially just a website). If you see someone speaking of a web app, it typically won't require any downloading, or separate applications. It is just delivered through your regular browser (like Firefox in your case).
Unless Apollo comes back with a Lemmy version, I don't intend to ever download a Lemmy app.
I've only ever used vger.app (just a frontend in your web browser). It does have filter and block settings under the Settings menu.
Due to that though I'm not really familiar with standard Lemmy and other apps. I think a recent update to Lemmy itself added the ability to personally block whole instances. I don't see that option in the vger app, but should be available from your instance login if it is up to date.
This is a message to people in generally, not specifically the top level comment:
If your instance, or app/frontend offers a keyword filter/block, I would suggest adding Chappelle to the list.
Politicians, or words of violence can also be added if you generally want a joyful experience on Lemmy; staying up to date the news and politics can be important, but some people get plenty of that from outside of Lemmy, and may want this to be a space to relax, chill, or experience their interests and hobbies, or something important to them on a personal level.
The unwelcoming post title aside (I assume in jest)...
A single takeaway of my personal opinion from this series of polls is that Gen Z is comfortable with themselves, don't feel the need to hide, and the older generations are following suit and/or the long fought battle for social change from the older generations have finally yielded an environment that people can just be themselves.
I'm 100% straight millennial (and thus didn't have to deal with this struggle personally), but I can for sure say the general culture today, I would feel comfortable being out in, but in 2012.... I would not have been. Still dealing with people I thought were accepting people falling for the the Prop 8 BS from.. what was that, 2008?
Proud for having a generally more accepting and welcoming culture/society.