Wants to "Access your data for all websites".
Hell no!! This is not even legal in the EU.

I thought it would make a difference in my experience with WebEx on browser, since as a Linux user, I cannot use the app. It is useless. screenshots are Irrelevant. There is no description.

good

The functionality:
This will open a desktop app for you after clicking a link. That is it. This doesn't change the way WebEx in the browser functions (tiling still isn't enabled as the screenshot make it appear, etc.) WebEx is still fairly unusable for Linux users, or Mac/Windows users who don't feel comfortable downloading the WebEx client.

The cost:
Webex can see all of your information on any website, ever. They can read your information when you access your bank accounts. They can read your information when you fill out your tax information. They can read anything, at anytime, and store it how they please.

My take: I don't think this is worth it.

Garbage extension, IDK how it got installed and why da heck it demands such ridiculously intrusive permissions

Yeah, like what the others have said: Totally suspect. This plug-in does not do anything in Firefox. I tried Webex without the plug-in and the web app works fine after you give the proper permissions inside FF.

I later installed the plug-in after I was able to get Webex to work as stated above, and did not notice anything different. What gives?

**Update**
FYI you need to have WebRTC enabled for WebEx to work properly inside FF. I was having issues of not being able to select my computer's audio (it wasn't even showing up as an option) and I wasn't able to select/see my webcam until I enabled WebRTC.

It also seems like the plug-in was needed before December 2019 in order for Webex to work inside a web browser. I believe with the advance of Firefox and the likes along with the re-writing of the Webex code from Cisco's side, that this plug-in is rendered obsolete. But it still does not make sense as this plug-in was updated on June 1, 2020 at the time of this writing.