Text in the Try Onion Services popup could be clearer

I feel like some of the text in the "Try Onion Services" popup is a bit misleading:

Title

It is currently "Try Onion Services", but this is a setting a preference that will be applied indefinitely, rather than for a short time. So it seems like it should be more like "Use Onion Services".

Body

The first sentence is

There is a more private and secure version of this site available over the Tor network via onion services.

Given the context of this being shown when you visit a HTTPS site, this seems to be telling the user that the current connection they have to the HTTPS site is less private and less secure than if they used the onion site. Moreover, there is no text in the "Learn more" link (https://tb-manual.torproject.org/onion-services/) to back this up. It only says

All traffic between Tor users and onion services is end-to-end encrypted, so you do not need to worry about connecting over HTTPS

but we already have HTTPS-Only mode in the browser.

In contrast, the second sentence

Onion services help website publishers and their visitors defeat surveillance and censorship.

is easily understood and backed up.

I feel like maybe this first sentence should be more of a light overview of what an onion service is, with the second sentence being the benefits, making it clear what is benefiting the tor browser user.

Button label

At least for me, "Not Now" tends to mean "I will bother you again in the future until you select the other option", so it can imply the popup will shown again for the next onion-available site, even though the user will never see it again. I think this is trying to indicate that you can always set this preference in the "Privacy & Security" settings in the future, but that could just be part of the body text if it is important.

Design estimate:

• Complexity: low (1 days)
  • Think about:
    • How would a new user understand this? Do a mini user journey.
    • What are the different ways the copy / design can be misunderstood?
  • Ask:
    • What is this thing?
    • How does it benefit me?
    • What are you asking me to do?
• Uncertainty level: high (2)
  • I don't do much copy, so it's a bit of a challenge for me.
  • There could be lenghty back and forth between stakeholders discussing the copy.
• Total: 1-2 days

Edit: Screenshot in 14.0: