What's stopping you from installing an ad-blocker like uBlock Origin? You can't help but notice them (no one really can), and it doesn't sound like they add value to your life.
https://github.com/gorhill/uBlock/
Facebook is a pretty high profile website, so it is unlikely that UBlock Origin won't block all adds there (I don't use Facebook myself, so I can't verify). In a normal desktop browser that is.
https://old.reddit.com/r/uBlockOrigin/comments/fnkwa4/facebo...
There is new-ish one that might work.
EDIT: No, now it's only the text that identifies it as "Sponsored" the rest of the ad does not disappear.
EDIT2: For an example here is how the word "Sponsored" is represented in the DOM:
<span aria-labelledby="jsc_c_cm" aria-label="Sponsored" class="j1lvzwm4 stjgntxs ni8dbmo4 q9uorilb gpro0wi8"><span
aria-label="Sponsored" aria-labelledby="jsc_c_cn"></span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4">S<span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">n</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">t</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">S</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">n</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">p</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4">p</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4">o</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4">n</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">i</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4">s</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">i</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4">o</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">S</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4">r</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">o</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">e</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">l</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">o</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4">e</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">c</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">n</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">s</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">c</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">s</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">o</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">r</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">e</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4">d</span><span
class="b6zbclly myohyog2 l9j0dhe7 aenfhxwr l94mrbxd ihxqhq3m nc684nl6 t5a262vz sdhka5h4"
style="position: absolute; top: 3em;">d</span></span></span>