I Don't Get Icon After Installing Firefox Extension

[tangerine101]

I downloaded the Firefox version of your extension 0.5. Firefox shows it installed and enabled but I don't get the icon on the toolbar to invoke it.
I figured out that I have to select "pin to toolbar" during installation to see the icon. But when I hover on the icon it says it's disabled and I have to enable it by using the pop-up window. When I click on it it is showing only a list of 400 Chrome user agents. There isn't anything there for Firefox.

[hackel]

First, the latest version is 0.6.6. Why are you using a version that's 2.5 years old? Did you select Firefox in the browser menu in top-center drop-down menu? (Or top-left in the latest version.)

[tangerine101]

0.6 doesn't support Firefox below 132. I'm running Firefox 115.31esr so I have to use 0.5.
I downloaded it from
https://addons.mozilla.org/en-US/firefox/addon/user-agent-string-switcher/versions/?utm_content=search&utm_medium=referral&utm_source=addons.mozilla.org
The website says:
Version 0.5.0
Released Apr 17, 2023 - 753.16 KB
Works with firefox 48.0 and later

1. fixes UA updating URL
2. updates UA list

[SwimmeRM]

Well ITMT v0.6.7 became last available one that my legacy MS Edge v109.0.1518.140 (Official build) (64-bit) received 2,5 days ago (BTW on my 'legacy' x64 OS too), and ITMT my FF Portable also became current/latest 115.35.0esr (64-bit) too... :-o 0:-)