add firefox theme

.gitignore

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+*.xpi
+.sass-cache/

README.md

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+# Arc Firefox Theme
+
+Offical [Arc](https://github.com/horst3180/Arc-theme) Firefox theme.
+
+#####Arc Firefox
+
+![alt tag](http://i.imgur.com/qHpAWT3.png)
+
+#####Arc Darker Firefox
+
+![alt tag](http://i.imgur.com/tjJf9T7.png)
+
+#####Arc Dark Firefox
+
+![alt tag](http://i.imgur.com/tv8C0Hs.png)
+
+
+### Requirements
+This theme is compatible with Firefox 40+.
+
+**Note**: This theme is meant to be used in conjunction with the Arc GTK theme, don't use it with other GTK themes or it will look broken.
+
+### Installation
+Run `make-xpi.sh` script to create the xpi files
+
+    ./make-xpi.sh
+
+This will create three .xpi files. One for Arc, Arc-Darker and Arc-Dark.
+Drag-and-drop these files into the Firefox window. Firefox will then prompt you to install the theme.

arc-firefox-theme/chrome.manifest

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+skin    browser         arc-firefox-theme   chrome/browser/
+skin    communicator    arc-firefox-theme   chrome/communicator/
+skin    global          arc-firefox-theme   chrome/global/
+skin    mozapps         arc-firefox-theme   chrome/mozapps/

arc-firefox-theme/chrome/browser/aboutCertError.css

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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+html {
+  background: -moz-Dialog;
+}
+
+body {
+  margin: 0;
+  padding: 0 1em;
+  color: -moz-FieldText;
+  font: message-box;
+}
+
+h1 {
+  margin: 0 0 .6em 0;
+  border-bottom: 1px solid ThreeDLightShadow;
+  font-size: 160%;
+}
+
+h2 {
+  font-size: 130%;
+}
+
+#errorPageContainer {
+  position: relative;
+  min-width: 13em;
+  max-width: 52em;
+  margin: 4em auto;
+  border: 1px solid #FFBD09; /* pale yellow extracted from yellow passport icon */
+  border-radius: 10px;
+  padding: 3em;
+  -moz-padding-start: 30px;
+  background: url("chrome://global/skin/icons/sslWarning.png") left 0 no-repeat -moz-Field;
+  background-origin: content-box;
+}
+
+#errorPageContainer:-moz-dir(rtl) {
+  background-position: right 0;
+}
+
+#errorTitle {
+  -moz-margin-start: 80px;
+}
+
+#errorLongContent {
+  -moz-margin-start: 80px;
+}
+
+.expander > button {
+  -moz-padding-start: 20px;
+  -moz-margin-start: -20px;
+  background: url("chrome://browser/skin/aboutCertError_sectionExpanded.png") left center no-repeat;
+  border: none;
+  font: inherit;
+  color: inherit;
+  cursor: pointer;
+}
+
+.expander > button:-moz-dir(rtl) {
+  background-position: right center;
+}
+
+.expander[collapsed] > button {
+  background-image: url("chrome://browser/skin/aboutCertError_sectionCollapsed.png");
+}
+
+.expander[collapsed] > button:-moz-dir(rtl) {
+  background-image: url("chrome://browser/skin/aboutCertError_sectionCollapsed-rtl.png");
+}

arc-firefox-theme/chrome/browser/aboutNetError.css

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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+@import url("chrome://global/skin/in-content/common.css");
+
+body {
+  display: flex;
+  box-sizing: padding-box;
+  min-height: 100vh;
+  padding: 0 48px;
+  align-items: center;
+  justify-content: center;
+}
+
+ul, ol {
+  margin: 0;
+  padding: 0;
+  -moz-margin-start: 1em;
+}
+
+ul > li, ol > li {
+  margin-bottom: .5em;
+}
+
+ul {
+  list-style: disc;
+}
+
+#errorPageContainer {
+  position: relative;
+  min-width: 320px;
+  max-width: 512px;
+}
+
+#errorTitleText {
+  background: url("aboutNetError_info.svg") left 0 no-repeat;
+  background-size: 1.2em;
+  -moz-margin-start: -2em;
+  -moz-padding-start: 2em;
+}
+
+#errorTitleText:-moz-dir(rtl) {
+  background-position: right 0;
+}
+
+#errorTitleText[sslv3=true] {
+  background-image: url("aboutNetError_alert.svg");
+}
+
+#errorTryAgain {
+  margin-top: 1.2em;
+  min-width: 150px
+}
+
+#errorContainer {
+  display: none;
+}
+
+@media (max-width: 675px) {
+  #errorTitleText {
+    padding-top: 0;
+    background-image: none;
+    -moz-padding-start: 0;
+    -moz-margin-start: 0;
+  }
+}
+
+/* Pressing the retry button will cause the cursor to flicker from a pointer to
+ * not-allowed. Override the disabled cursor behaviour since we will never show
+ * the button disabled as the initial state. */
+button:disabled {
+  cursor: pointer;
+}
+
+div#certificateErrorReporting {
+  display: none;
+  float: right;
+  /* Align with the "Try Again" button */
+  margin-top: 24px;
+  -moz-margin-end: 24px;
+}
+
+div#certificateErrorReporting a {
+  text-decoration: none;
+}
+
+div#certificateErrorReporting a:hover {
+  text-decoration: underline;
+}
+
+span.downArrow {
+  display: inline-block;
+  vertical-align: middle;
+  font-size: 0.6em;
+  -moz-margin-start: 0.5em;
+  transform: scaleY(0.7);
+}
+
+div#certificateErrorReportingPanel {
+  /* Hidden until the link is clicked */
+  display: none;
+  background-color: white;
+  border: 1px lightgray solid;
+  /* Don't use top padding because the default p style has top padding, and it
+   * makes the overall div look uneven */
+  padding: 0 12px 12px 12px;
+  box-shadow: 0 0 4px #ddd;
+  font-size: 0.9em;
+  position: absolute;
+  width: 75%;
+  margin-top: 10px;
+}
+
+div#certificateErrorReportingPanel:-moz-dir(ltr) {
+  left: 34%;
+}
+
+div#certificateErrorReportingPanel:-moz-dir(rtl) {
+  right: 0;
+}
+
+#errorStatePanel {
+  display: flex;
+  flex-direction: row;
+  flex-wrap: wrap;
+  justify-content: space-between;
+  align-content: space-between;
+  align-items: flex-start;
+}
+
+span#hostname {
+  font-weight: bold;
+}
+
+#automaticallyReportInFuture {
+  cursor: pointer;
+}

arc-firefox-theme/chrome/browser/aboutProviderDirectory.css

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+@import url("chrome://global/skin/in-content/common.css");
+
+#errorPageContainer {
+  min-width: 50%;
+}
+
+#errorTitle {
+  background: url("aboutNetError_info.svg") left 0 no-repeat;
+  background-size: 2em;
+  -moz-padding-start: 3em;
+}
+
+#button-box {
+  text-align: center;
+  width: 75%;
+  margin: 0 auto;
+}
+
+button {
+  width: auto !important;
+  min-width: 150px;
+}
+
+@media all and (max-width: 300px) {
+  body {
+    padding: 0px 10px;
+  }
+  #errorPageContainer {
+    min-width: 100%;
+  }
+  #errorTitle {
+    background: none;
+    -moz-padding-start: 0 !important;
+  }
+  button {
+    width: auto !important;
+    min-width: auto !important;
+  }
+}
+
+
+body {
+  width: 310px;
+  margin: 1em auto;
+}
+
+#message-box {
+  margin-top: 2em;
+  background: url('chrome://global/skin/icons/information-24.png') no-repeat left 4px;
+  -moz-padding-start: 30px;
+}
+
+#activation-frame {
+  border: none;
+  margin: 0;
+  width: 310px;
+  height: 200px;
+}
+#activation > p {
+  width: 100%;
+  text-align: center;
+  margin: 0;
+  line-height: 2em;
+}
+.link {
+  text-decoration: none;
+  color: -moz-nativehyperlinktext;
+  cursor: pointer;
+}

arc-firefox-theme/chrome/browser/aboutSessionRestore.css

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+
+.title {
+  background-image: url("chrome://browser/skin/session-restore.svg");
+}
+
+treechildren::-moz-tree-image(icon),
+treechildren::-moz-tree-image(noicon) {
+  padding-right: 2px;
+  margin: 0 2px;
+  width: 16px;
+  height: 16px;
+}
+
+treechildren::-moz-tree-image(noicon) {
+  list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.png");
+}
+treechildren::-moz-tree-image(container, noicon) {
+  list-style-image: url("chrome://browser/skin/aboutSessionRestore-window-icon.png");
+}
+
+treechildren::-moz-tree-image(checked) {
+  list-style-image: url("chrome://global/skin/in-content/check.svg#check");
+}
+treechildren::-moz-tree-image(checked, selected) {
+  list-style-image: url("chrome://global/skin/in-content/check.svg#check-inverted");
+}
+
+treechildren::-moz-tree-image(partial) {
+  list-style-image: url("chrome://global/skin/in-content/check-partial.svg#check-partial");
+}
+treechildren::-moz-tree-image(partial, selected) {
+  list-style-image: url("chrome://global/skin/in-content/check-partial.svg#check-partial-inverted");
+}