SellerSprite extension has updated to version 2.8.1 in 2021 and added a ton of useful features.
8 main features: The copy of Keepa Extension, Product Research, Reverse ASIN Keyword, Keyword Mining, keyword Checker, Bulk Request Review, Listing Quality Score, Product Page Quick View!
1. The copy of Keepa Extension-lifetime free trial

Tips: all the numbers in blue could be clicked, and you're able to view the trends or more details.
2. Product Research-get product insights
Get data insight into the products on the search result page you’re viewing, including monthly sales, revenue, sales trends, price, BSR, reviews, rating, etc.
3. Reverse ASIN Keyword-find competitor keywords
4. Keyword Mining-get keywords for listing and PPC
Discover all the keywords related to your target market based on the keywords in the search box.
Intelligent Mining: find out the core keywords related to the search results.
Get Keywords: find out the keywords that include the keywords entered in the search box.
5. keyword Checker-see if your keywords get indexed
Check to see if your products are showing up in the search results for your top keywords in 30 seconds.
6. Bulk Request Review-request reviews with one click
Enable seller to filter orders, and send review requests for orders in bulk, or individually.
7. Listing Quality Score-see Listing’s performance
To see whether a listing fully optimized.
8. Product Quick View
View product info and data without having to enter into the listing page.
9. Review/QA Download-get shopper's pain point
10. Listing image/A+Image/Customers Image Download

11. Amazon Page Bookmark-support sync bookmarks in different browsers
More powerful features:
1. Get the data for the keywords you searched on the Amazon search box.
2. View the hijacker’s location info on the page where sellers can sell products others are selling.
3. SellerSprite’s extension has FBA profitability calculator, google trends, etc, and all search results can be exported!
Thousands of Amazon Sellers are using SellerSprite’s extension, download now.