Avoid this kind of useless shop-savings extensions that in facts can spy what you are looking on the internet, it's just collecting informations on you to profile you and similar customers to finally target ads/products/services. That's desguished spyware in counterpart to provide you a pretended nice service for free.

And just about the service provided: this kind of extensions (lots of similar exist like this one) can modify the webpages on-the-fly and also can censure some parts or search results to guide you to buy to a specific shop... instead of a concurrent. And guess who is paying the extension editor to do that? Sellers?
Just look at what this extension is requiring at the Permissions part...

Mind again before adding browser extensions!

As of September 2020 this is broken. It keeps asking me to log on but if I click to log-on it brings me to the Rakuten website where I am logged on I go back to the shopping site where I get asked again to log-on by Rakuten and so on and so on.....

When it worked before it was great. But currently it's useless.

Next to useless with UBlock Origin installed. It barks that I have to add the following to UBlock Origin

: "Ebates Cash Back Shopping"
https://www.rakuten.ca/static/cashback-shopping-whitelist?

Which I do. UBlock origin even has Rakuten's Cash Back Shopping filter lists installed yet it continues to complain when I go to say ebay. About to ditch this add on altogether.

The WORST addon I have ever used. Either it's running a miner in the background, or the programmers simply suck at their jobs, whenever I have this specific addon enabled, my Firefox CPU usage jumps to 80+%. No other addon does this. The instant I disable this addon, the usage drops back to the usual 0-5% idle.

If you use eBates, make sure you keep this addon disabled when you aren't using it. I have notified customer support but they didn't care at all.

I have recently been told by Ebates.ca customer service that "Some stores, like Amazon.ca, have chosen not to participate in the Button program" and therefore this is essentially a useless spyware add-on