Not all of them, but the most successful from Biontech/Pfizer and moderna are both mRNA based. However there were also others based on protein subunits or viral vectors for example.
If your question is whether crispr gene editing was used by any of the vaccines, then no none of them used it as a direct mechanism.
However it might have been used somewhere along the line in their creation, e.g. to knock out a gene in the viral vectors. But i couldn't tell you that with certainty.
Yeah, the possibilities are definitely exciting. But i guess as far as Covid19 vaccines are concerned it was probably a good thing that none required their direct use.
As is we already had a ton of missinformation and fearmongering, i don't even want to imagine how bad it would have been, if gene editing was involved in any direct way.
Yes, mRNA was a huge breakthrough developed by the massive r&d rush from covid vaccine funding. Now we reap it's benefits as it has a huge amount of applications on a lot of other things too.