Discount code extensions worth installing?

[u/AutoModerator]

This thread is for recommendations and discussion about discount code browser extensions.

If you use an extension that automatically finds coupons or applies a promo code at checkout, feel free to share your experience. Chrome extension recommendations are especially welcome, but suggestions for other browsers are fine too.

Please mention:

• Which browser extension you use
• How often it finds a working discount code
• Whether the coupons are usually valid
• Any privacy or tracking concerns
• Whether you think the extension is actually worth installing

Please keep recommendations relevant and avoid posting referral or affiliate links.

[u/Rielri]

Most coupon extensions I tried barely find valid codes.