Fun browser extension, changing all words ending with a to end with er.
This started as a joke between friends and me, pronouncing words ending with an a or an a in the last syllable, as if it was er instead.
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Going down a Wikipedier rabbithole about a country's locerl florer and fauner while drinking cocer coler just became even better!
The parsing and settings code was adapted from https://github.com/m1l/Everything-Metric-Firefox