What has been an audit in Chrome via Lighthouse has made its way into the latest version of Firefox. The feature is still in beta but provides an easy way to quickly check a page for color pairings that do not meet the WCAG standards for color contrast.
Color contrast is an important part of accessibility as it makes text easier to read for everyone, not just those with impairments.
To run the audit open the developer tools (F12) -> click
Accessibility in the developer tools menu -> click
Turn On Accessibility Features, if necessary, and finally click
contrast in the sub-menu at the top under "Check for issues".
Once the audit has completed you can see which text does not meet the standard and details about why such as the colors used and the ratio of those colors.