The initial version.

README.markdown

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+A [browser extension](http://likeplusone.org/) that reduces your risk of getting
+carpal tunnel syndrome up to 50% by turning Like into Like+1 buttons.

background.html

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+<!--
+  The markup for a background page that manages interest data.
+
+  Copyright 2011 Ashkan Soltani and Brian Kennish
+
+  This program is free software: you can redistribute it and/or modify it under
+  the terms of the GNU General Public License as published by the Free Software
+  Foundation, either version 3 of the License, or (at your option) any later
+  version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+  FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program. If not, see <http://www.gnu.org/licenses/>.
+
+  Authors (one per line):
+
+    Brian Kennish <byoogle@gmail.com>
+-->
+<script src="background.js"></script>

background.js

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+/*
+  The script for a background page that manages interest data.
+
+  Copyright 2011 Ashkan Soltani and Brian Kennish
+
+  This program is free software: you can redistribute it and/or modify it under
+  the terms of the GNU General Public License as published by the Free Software
+  Foundation, either version 3 of the License, or (at your option) any later
+  version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+  FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program. If not, see <http://www.gnu.org/licenses/>.
+
+  Authors (one per line):
+
+    Brian Kennish <byoogle@gmail.com>
+*/
+
+/* Destringifies an object. */
+function deserialize(object) {
+  return typeof object == 'string' ? JSON.parse(object) : object;
+}
+
+/* The saved like+1s. */
+var likeplusones = deserialize(localStorage.likeplusones) || {};
+
+/* Adds or removes a like+1. */
+chrome.extension.onRequest.addListener(function(request) {
+  var page = request.page;
+  request.likeplusoned ? likeplusones[page] = Date.now() :
+      delete likeplusones[page];
+  localStorage.likeplusones = JSON.stringify(likeplusones);
+});

content.css

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+/*
+  A content style sheet that munges Like buttons.
+
+  Copyright 2011 Ashkan Soltani and Brian Kennish
+
+  This program is free software: you can redistribute it and/or modify it under
+  the terms of the GNU General Public License as published by the Free Software
+  Foundation, either version 3 of the License, or (at your option) any later
+  version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+  FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program. If not, see <http://www.gnu.org/licenses/>.
+
+  Authors (one per line):
+
+    Brian Kennish <byoogle@gmail.com>
+*/
+.likeplusone {
+  min-width: 96px;
+  min-height: 24px
+}
+
+.connect_widget_number_cloud { width: 56px !important }
+
+.uiGrid .thumbs_up_icon,
+.connect_widget_like_button.like_button_like .tombstone_cross {
+  margin-right: 0
+}
+
+.uiGrid .thumbs_up_icon {
+  background-image: none;
+  width: 0
+}
+
+.connect_widget_number_cloud_summary .connect_widget_connected_text,
+.connect_widget_number_cloud_summary .connect_widget_not_connected_text {
+  font-size: 16px
+}
+
+.connect_widget_like_button.clearfix { padding: 2px 4px }
+
+.connect_widget_like_button.like_button_like .tombstone_cross,
+.connect_widget_like_button.clearfix.like_button_like .tombstone_cross:hover,
+.connect_widget_like_button.clearfix.like_button_no_like .liketext {
+  background-position: 0
+}
+
+.connect_widget_like_button.like_button_like .tombstone_cross,
+.like_button_no_like .liketext {
+  width: 48px;
+  height: 18px
+}
+
+.connect_widget_like_button.like_button_like .tombstone_cross {
+  background-image:
+      url(chrome-extension://lpehokhlnomihmdpgoclgbapaglbclfg/likeplusone.png)
+}
+
+.connect_widget_like_button.clearfix.like_button_no_like .liketext {
+  background-image:
+      url(chrome-extension://lpehokhlnomihmdpgoclgbapaglbclfg/unlikeplusone.png);
+  padding-left: 0
+}
+
+.connect_widget_like_button.like_button_like .liketext, .hidden {
+  display: none
+}
+
+.uiGrid .connect_widget_button_count_count {
+  padding-top: 2px;
+  padding-bottom: 4px;
+  font-size: 12px
+}
+
+.fbSendButton { left: 64px !important }
+
+.connect_confirmation_cell { left: 118px !important }

content.js

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+/*
+  A content script that munges Like buttons.
+
+  Copyright 2011 Ashkan Soltani and Brian Kennish
+
+  This program is free software: you can redistribute it and/or modify it under
+  the terms of the GNU General Public License as published by the Free Software
+  Foundation, either version 3 of the License, or (at your option) any later
+  version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+  FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program. If not, see <http://www.gnu.org/licenses/>.
+
+  Authors (one per line):
+
+    Brian Kennish <byoogle@gmail.com>
+*/
+
+/* Messages the page and Like+1 state internally and a + or -1 externally. */
+function likeplusone(likeplusoned) {
+  var page =
+      location.href.indexOf(like, 7) >= 7 ?
+          decodeURIComponent(location.search.split('href=', 2)[1].split('&', 1))
+              : location;
+  chrome.extension.sendRequest({page: page, likeplusoned: likeplusoned});
+  $('head').append(
+    '<script type="text/javascript" src="http://apis.google.com/js/plusone.js"></script>'
+  );
+  $('body').append(
+    '<div class="hidden"><g:plusone href="' + page + '"></g:plusone></div>'
+  );
+
+  setTimeout(function() {
+    $('[src*="plusone.google.com/u/0/_/+1/button"]').
+      attr('src', function(index, source) { return source += '#like+1'; });
+  }, timeout);
+}
+
+/* The, partial, URL of the Like iframe. */
+var like = 'www.facebook.com/plugins/like.php';
+
+/* The +1 timeout, in milliseconds. */
+var timeout = 2000;
+
+$('[src*="' + like + '"]').addClass('likeplusone');
+
+/* Splits the like stream. */
+$('.connect_widget_like_button').
+  click(function() { likeplusone(true); }).
+  children('.liketext').html('');
+
+/* Splits the unlike stream. */
+$('.tombstone_cross').click(function() { likeplusone(); });
+
+/* Simulates a click on the +1 button. */
+setTimeout(function() {
+  if (location.hash.split('#').pop() == 'like+1') {
+    // jQuery seems to bite the bag here.
+    var click = document.createEvent('MouseEvents');
+    click.initMouseEvent('click', true, true);
+    document.getElementById('button').dispatchEvent(click);
+  }
+}, timeout);