Accessibility Settings
Theme
Only works with JavaScript.
Font
Support not guaranteed, but provided as options anyways:
Disabling the alt-text popup or forced uncapitalization does not affect "normal" accessibility. The alt-text pop-up is custom made in replacement of using the title attribute, and forced uncapitalization is done using CSS's text-transform.
These settings are done entirely with CSS (except the Theme settings), and will be saved into your browser if you have JavaScript enabled. Otherwise, your settings will not be saved.
...I honestly have no idea what you're doing that "requires payment" for you to end up here, but congrats!