2 GitHub repositories tagged firefox-addon. Explore emirmrkaljevic/shrinkwatch-eu, emirmrkaljevic/truediscount.
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Free Firefox add-on that shows price per kg/l and warns about shrinkflation on EU grocery shops.
Free Firefox add-on and userscript that checks EU shop discounts against the 30-day lowest price
Free listing, live immediately, and it stays discoverable long after launch day. Paid placement is optional and starts at $3.