DarkReader for Google Chrome

This extension inverts brightness of web pages and aims to reduce eyestrain while browsing the web. Visit Chrome Web Store for more info.

How it works

The extension simply adds a stylesheet which inverts colors of the whole page and reverts necessary blocks back.

<style id="dark-reader-style" type="text/css">
    html {
        -webkit-filter: invert(100%);
    }
    img, iframe, video {
        -webkit-filter: invert(100%);
    }
</style>

Fixing the inversion of specific blocks

If some blocks of web page should not be inverted, the sites_fixes.json file should be edited. The url value contains URL-template for matching page's URL and selectors value contains CSS selectors for matching the specific blocks that should not be inverted. If there would be no matches found for page URL, then commonSelectors values would be used to generate CSS. The rules value is used to fix things which cannot be corrected with contrary revertions.

{
    "commonSelectors": "img, iframe, video",
    "specials": [
        {
            "url": "youtube.com",
            "selectors": "iframe, .html5-video-player, div:not(.html5-video-player) img"
        },
        {
            "url": "google.*",
            "selectors": "img, iframe, video, span.gb_X.gbii",
            "rules": "body { background-color: white !important; }"
        }
    ]
}

List of sites with dark background

Besides using settings-page site list, dark-themed web-sites can be added into global dark sites list (dark_sites.json) to make them not inverted by default. Possible values for matching the web-site URL are listed below.

[
    "google.*",
    "mail.google.com",
    "google.com/mail"
]

Building and debugging

In order to build and debug the project install the nodejs and grunt task runner. Launch the > grunt debug task. Open the Chrome's extensions page. Enable the Developer mode, press Load unpacked extension button, navigate to project's src/ folder.

After making any code changes, the project should be recompiled (debug-watch task may be used for auto-compile) and reloaded in Extension page by pressing the Reload (Ctrl+R) hyperlink.

For editing the sites_fixes.json and dark_sites.json files any text editor may be used. For editing TypeScript and LESS files you may use Visual Studio Code, Visual Studio Community 2013 or any other web IDE.

Good luck!