Is there a safe way to permanently remove job postings from appearing in various listings on my browser?

Hi!

Nursing student here, BUT NOT FOR LONG!!! ...nearing graduation and have started the tedious process of scouring the internet for desirable job postings.

I've been at this a few weeks, and am finding myself scrolling through the same postings repeatedly, many of which I have either no interest in applying to, or am not eligible for.

My thought was to use uBlock Origin to 'block element' on those postings, but idk shit about this kind of tech, and I'm worried if I start doing this, I'll inadvertently block new postings that come up later - and won't know cuz it won't be visible.

Not trying to block an entire hospital's worth of posts, but like the nurse manager positions, CRNA, or clinics like cath lab which require a year of ICU experience (which I don't have)... there are also a ton of technician and physician positions popping uo despite searching for 'nurse'... I'd like to just nuke those from my browser so that when I look for new postings later I'm only seeing positions that are actually new.

Any thoughts on the best way to do that without shooting myself in the foot and obscuring new postings that might get snagged by this kind of filtering?

Edit- probably helpful to mention that I'm using Windows 10 and firefox, lol.