Information:

These modifications weren't approved by anyone at all.
Bug me if something's wrong, not the original author.
I'd probably enjoy fixing it more than they would, anyways.

Original at: https://addons.mozilla.org/en-US/firefox/addon/8209

Alternate installation:
1. Download the GSHI_full_flat_absolute_black-3.0-fx-win.jar file
2. Open the Add-ons window from Firefox, and navigate to the Themes section
3. Drag and drop the .jar file into the themes section, and it'll ask if you want to install.
4. Say yes, and it should be available to you the next time you restart Firefox.

I(ugetab) have changed a myriad of files in an effort to make the theme more to my liking,
and to be more similar to the GSHI Forum and Site themes.

Here's a list of overall changes made to the theme:

General Editing across all files:

(Site Theme Silver-Grey)
All occurances of #CCCCCC in all .CSS files have been changed to #DEE3E7

(Site Theme Green)
Original
Browser.css:
.ac-url-text {
  color: #336633;
}

Edit:
.ac-url-text {
  color: #00FF00;
}

---
Specific edits:

Apply Black Background to Tooltips
Global/Popup.css
- (Modify shown lines)
tooltip {
  -moz-appearance: none;
  background-color: #000000;
}
-


Changed 'InfoBackground' variables to '#000000' in these files:
\browser\feeds\subscribe.css
\global\formatting.css
\global\popup.css (Done above)
\mozapps\extensions\update.css
\mozapps\update\updates.css


White-space between Scroll Bar customization:
Global/Scrollbars.css
- (Replace the existing scrollcorner section)
scrollcorner { 
  -moz-appearance: none; 
  -moz-binding: url(chrome://global/content/bindings/scrollbar.xml#scrollbar-base);
  border: 1px solid;
  -moz-border-top-colors: #DEE3E7;
  -moz-border-right-colors: #000000;
  -moz-border-bottom-colors: #000000;
  -moz-border-left-colors:#DEE3E7;
  width: 10px;
  cursor: default;
  background-color: #000000;
}
-
menu checks
Global\Menu.css
(For ImgLikeOpera selection check-mark)
-
[Change from]
.menu-iconic-icon {
  width: 16px;
  height: 16px;
}
[Change to]
.menu-iconic-icon {
  max-width: 16px;
  max-height: 16px;
}

AND

[Change from]
menuitem[type="checkbox"] > .menu-iconic-left,
menuitem[checked="true"] > .menu-iconic-left {
  -moz-appearance:  menucheckbox;
}
[Change to]
menuitem[checked="true"] > .menu-iconic-left {
  list-style-image: url("chrome://global/skin/checkbox/cbox-check-dis.png");
  -moz-image-region: auto;
}
-

DOM Tree Text Color:
Global\Tree.css
- (Modify shown lines)
treechildren::-moz-tree-cell-text(Name, separator) {
  color: #DEE3E7;
}
-