> ## Documentation Index
> Fetch the complete documentation index at: https://docs.onsleek.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Browser extensions
> Sleek delivers your business a white-label browser extension.
Sleek's team will deliver a custom browser extension with your branding. By
default all browser extensions include the following details:
* **Accessibility (a11y)**: Sleek ensures that all browser extensions are `WCAG
2.1` compliant.
* **Performance**: Sleek ensures that all browser extensions are optimized for
performance, using internal benchmarks for browser extension performance and
best practices.
* **Security**: Sleek ensures that all browser extensions are secure by using
principles of least privilege and strict guarantees for code isolation and
data privacy.
## Supported platforms
* 💻 **Desktop**
* Chrome (v. 88+)
* Firefox (v. 109+)
* Safari (v. 15.4+)
* Edge (v. 88+)
* Opera (v. 74+)
* 📱 **Mobile**
* iOS Safari (v. 15+)
## Supported features
Sleek custom browser extensions support the following feature sets:
### 💰 Cashback and deals
Users can earn cashback and rewards on their purchases when they shop through
your custom browser extension. Rewards on the fly with user experiences that are
light and delightful, right on the checkout page and search engine result page.
Learn more about the cashback and deals feature set.
### 🎫 Coupon auto-apply
Users can automatically apply coupons at checkout with your custom browser
extension. Reward users with discounts, with Sleek handling the application of
coupon codes, finding the best code for a basket, and the tracking of the
discount.
Learn more about the coupon auto-apply feature set.