Bugzilla

**Found in**
*  Firefox 119.0a1 (2023-09-21)

**Tested platforms**
* Affected platforms: All

**Preconditions**
* browser.shopping.experience2023.enabled- "**true**"
* browser.shopping.experience2023.optedIn - "**1**"

**Steps to reproduce**
1. Open Firefox Nightly.
2. Navigate to an Amazon/Walmart/Bestbuy product page. ([example](https://www.amazon.com/Electric-Height-Adjustable-Standing-inches/dp/B09H2GYSNG/ref=sr_1_7?crid=MA3ADK00FZ2B&keywords=standing+desk&qid=1695312755&sprefix=standing+des%2Caps%2C208&sr=8-7))
3. Click on the ```Show more``` button in the "*Highlights from recent reviews*" section of the review checker sidebar.
4. Scroll down inside the review checker sidebar.

**Expected result** 
* According to the figma spec the header of the sidebar should remain in view regardless of the scroll position.

**Actual result**
* The header moves out of view as you scroll down.

**Regression range**
* Not a regression.

**Found in**
*  Firefox 119.0a1 (2023-09-21)

**Tested platforms**
* Affected platforms: All

**Preconditions**
* browser.shopping.experience2023.enabled- "**true**"
* browser.shopping.experience2023.optedIn - "**1**"

**Steps to reproduce**
1. Open Firefox Nightly.
2. Navigate to an Amazon/Walmart/Bestbuy product page. ([example](https://www.amazon.com/Electric-Height-Adjustable-Standing-inches/dp/B09H2GYSNG/ref=sr_1_7?crid=MA3ADK00FZ2B&keywords=standing+desk&qid=1695312755&sprefix=standing+des%2Caps%2C208&sr=8-7))
3. Click on the ```Show more``` button in the "*Highlights from recent reviews*" section of the review checker sidebar.
4. Scroll down inside the review checker sidebar.

**Expected result** 
* According to the figma spec the header of the sidebar should remain in view regardless of the scroll position.

**Actual result**
* The header moves out of view as you scroll down.

**Regression range**
* Will return with a regression-range asap.