Entirely possible, I'm on a work-issued laptop and I can't install extensions, because raw-dogging the internet is safer than letting employees block ads.
I'm guessing you're on Edge if you're in that predicament; in that case you should check if you can set tracker blocking to "strict". It doesn't work completely like an ad blocker (it doesn't hide broken elements for instance) but that may block loads of unwanted content without needing permission to install addons.