custom mode not work

I had an addong called useragent switcher before and this aint it! Wish I could find it. I don't know what to do in this current version. I used the button on the tool menu and selected a newer version of Firefox but when I click test it still shows my actual version--52.5 ESR and it doesn't fool the addons site when I try to install a new addon. So far none of the user agent addons are working, so adding to the list of fails.

The menu occasionally shows "recommendations" (ads!) for other add-ons that are not directly linked to the mozilla add-on page. This feels shady, and generally unsafe.

I feel uncomfortable using this add-on and have uninstalled it.

This add-on can: Access your data for all websites

Really now? How about no. Why even such simple addon want ALL OUR DATA

askew

I really like the blacklist & white list features. however every time I press save, all my settings are lost

Opens a tab at the far right containing a webpage asking for money(donations), then shows google ads in there.

Completely useless.. I can't even save a list of crawler user agents (like Googlebot or Bingbot) with which I want to visit a site.. a single textfield isn't going to cut it.

They popped up an ad begging for a review when I was doing something, and then when I removed it I get a "why did you uninstall". I'd expect that in Chrome not FF.