Some browser extensions can block Coupons.com and prevent cashback from being tracked. Below are common examples:
Chrome extensions:
Adblock Plus, Ad Blocker, Avast Online Security, Ad Blocker Pro, Simply Block Ads, Premium Ad Blocker, Super Ad Blocker, Adguard Adblocker, Ghostery, uBlock Origin, SuperBlock Ad Blocker, Adware Removal, uBlock Plus Ad Blocker, uBlock Adblock Read, Extended SuperBlock, uBlock Adblocker Plus, AdBlocker Fixed, Trustnav Ad Blocker, uBlock Plus, Ad Blocker for Chrome, uBlock Ultimate Adblocker, AdBlock Ad Cleaner, Avira Safe Shopping, AdGuard
Firefox extensions:
Adblock Plus, Adblock Edge, uBlock Origin, NoScript, Ghostery, Automatically Delete Cookies, Ad Blocker, Ultimate AdBlocker, Adguard AdBlocker, Ad Blocker 57+, AdBlocker Lite, CanvasBlocker, DuckDuckGo Plus
Note: This list may not be exhaustive. Other extensions could also prevent cashback from being tracked.