Dark Mode

1. Download the zip above and unzip it. You get a folder called mes-dark-mode. Keep it somewhere permanent (Documents is fine): the browser reads the extension from that folder.
2. Open the extensions page: chrome://extensions in Chrome, brave://extensions in Brave, edge://extensions in Edge.
3. Turn on Developer mode (a switch at the top right, or on the left in Edge).
4. Click Load unpacked and choose the unzipped mes-dark-mode folder.
5. Click the puzzle-piece icon in the toolbar and pin MES Dark Mode.

Chrome may show a "disable developer mode extensions" notice when it starts: choose Cancel / Keep. Brave and Edge usually do not. Until the extension is listed in the Chrome Web Store, updates are manual: download the new zip, replace the folder and press the reload arrow on the extensions page. Firefox is not supported yet.

• Smart invert. It first looks at how the page is painted. If you want dark and the page is light (or the other way round), it adds one stylesheet that flips the page's colours and flips photos, video, canvas, embedded frames and CSS background images back so they look normal. If the page already matches, it does nothing, so sites with their own dark theme are not made worse.
• Remembers each site (on your computer only) so a dark site is not flashed light on your next visit.
• Per-site choice. In the toolbar popup set a site to Auto, Dark, Light or Off. Alt+Shift+D flips the current site between dark and light.
• Setups. Save different modes and looks for different purposes (it ships with Dark, Follow system, Night (dim and warm) and Paper (light, warm)), switch in the popup, and export or import them as text.
• Tweaks: brightness, contrast, sepia and grayscale, and a schedule (for example dark from 19:00 to 07:00).

Inverting is the most reliable way to darken any page, but it is not a hand-tuned theme: brand colours can shift in hue a little, and a dark logo on a transparent background can disappear against the dark page (there is a setting to invert images too). If one site looks wrong, set it to Off or Light in the popup. It cannot change browser pages (chrome://), the Web Store or the built-in PDF viewer.

Permissions: it has to run on every page you open to be able to darken it, which the browser words as "read and change your data on all websites". It does not read page content: it only checks the background colour to see whether the page is dark, and adds the stylesheet. storage keeps your setups and the per-site memory; activeTab lets the popup show the current site.