For people with low vision (and not only for them), high contrast mode can be a great improvement for browsing the web. But not every page is high contrast mode friendly - he're how to change it.
this is what I do (<- this note is important in case I had a brain injury between now and Saturday)
law – required for government websites; in US even for companies with government contracts
In High Contrast mode Windows will change the foreground colors (used for text, borders, etc.) and background colors to create a greater contrast. The font size is often increased as well. These adjustments make it easier for users with visual impairments to see the screen.Some examples of the types of users who benefit from High Contrast mode are: Users who have low vision; anyone with a visual impairment that can’t be corrected with glasses, but is not in the range of legal blindness. Users with low vision may use screen magnification, bigger screens, larger fonts, high contrast, screen reading, or other assistive technology. Users with low vision can perceive light, so more contrast can make it easier to see the screen. Users with color vision deficiencies (also known as color blindness) Users who’s eyes are sensitive to light. Users can turn on low contrast theme or darker themes as their eyes are very sensitive to light.
firefox – bug with border color on form elements – doesn’t show in HCchrome modes – increased contrast, grayscale, inverted color and greyscale, yellow on blackMac – it’s not a “software” thing, it just inverts the output