Themes for Mozilla / Netscape / SeaMonkey
Lo-Fi
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Home Button (old version 0.4 with support for Lo-Fi)

Mozilla 1.7 (emoticons fixed, the version on gashu.org might be older) Install
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Netscape 7.1 (Mozilla 1.4 version with throbber from Netscape 7 version) Install
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Netscape 7.2* (Mozilla 1.7 version with throbber from Netscape 7 version) Install
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SeaMonkey 1.0 / Mozilla 1.8 (derived from Mozilla 1.7 version) Install
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Breeze
Homepage no longer exists

Mozilla 1.7 (based on Mozilla 1.5 version) Install
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Netscape 7.1 (original version by Flyson) Install
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Netscape 7.2* (Mozilla 1.7 version with throbber from Netscape 7.1 version) Install
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SeaMonkey 1.0 / Mozilla 1.8 (derived from Mozilla 1.7 version) Install
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*= How to remove the "New Tab" text in Netscape 7.2
Solution a)
1. in the install language file lang[xyz].xpi (ZIP archive) locate bin/chrome/[xyz]-[XYZ].jar (not -mac, -unix or -win file)
or (if already installed) in the Netscape /chrome directory
2. In [xyz]-[XYZ].jar (also a ZIP archive) locate locale/[xyz]-[XYZ]/global/tabbrowser.dtd
3. Open tabbrowser.dtd and change the line beginning with <!ENTITY newTab.label ...
to <!ENTITY newTab.label "">
Solution b)
In the user profile /chrome directory put the following line into userChrome.css:
.tabs-newbutton > .toolbarbutton-text { display: none; }