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As requested https://forum.userstyles.org/discussion/46739/firefox-add-ons-manager-request-for-new-style-or-editing-help-with-css Styles the about:addons page to how it previously appeared, in Firefox 39 and before. Known bug: "Available Updates" counter is obscured.
A dark blue theme that is imitative of the Firefox web developer tools visual style. It affects the Library / Places page ( chrome://browser/content/places/places.xul ) and the bookmarks sidebar. Made in Windows 7 (Aero disabled), so I don't know how it will look on other operating systems.
Some CSS play. Works smoothly on small, simple pages, but on pages with lots (or even moderate amount) of content to load, the transition is choppy. Tested on Firefox (5.0 is the minimum version supported) and Chrome. Sometimes doesn't work when navigating via Back and Forward buttons?
Recommended - Pseudo element version: Simply change the opacity in the code to adjust the "brightness". IFRAMEs will be doubly affected. Uses pointer-events property. Confirmed working in Chrome and Firefox.
I wanted to make things look plain, so here it is. K3YW0RD5: Plain basic clean stealth
Restores Cached and Similar links to be seen in plain view. If no links appear, it means Google does not have any links to offer (page not cached, no 'similar' option provided).
Make images that have a href attribute (image link) be highlighted in blue, on hover. Not so good with small containers, as the shadow will be cut-off. A similar style: Puts a box around hovered linked images If you want to remove the dotted frame when clicked, use Remove Link Dotted Line Frame.
Hides the appearance of cufon text and shows plain text instead. Cufon / Cufón Note: This only handles cufon using the canvas element. I don't know if there are other versions.
For Chrome users/WebKit browsers. Page scrolling speed is slowed when this style is active. What it does: Makes websites grayscale / greyscale, then inverts it. This affects everything (except video and probably any embed objects). Affects images as well. How to use: When you come across a website that is too dark/light, you add the website to the list of affected sites to make it opposite of what it currently is - dark becomes light, light becomes dark. Play with the values to whatever you prefer. You can delete brightness and contrast properties in code to slightly increase scrolling performance. Use it on sites that mainly have text content.
As requested - http://forum.userstyles.org/discussion/36471/macupdate.com-black-background-white-text#Item_5 This style won't be supported.