Add margins to wide pages.
Narrower is a simple extension for dealing with annoyingly wide websites.
To add margins to a wide page, click on the extension icon and drag the slider.
To return the page to it's previous state, either drag the margin slider to 0%, or refresh the page.
How it works:
When you drag the margin slider, Narrower changes the padding value of `document.documentElement`. It then leaves the selected margin in a cookie, so it can be recalled the next time you activate the extension on the site.
Changing the padding of the document element doesn't work on 100% of the pages. If a page doesn't become narrower as a result of using the extension, you can always resort to manually changing the browser window size.