diff -r 000000000000 -r 6474c204b198 browser/devtools/sourceeditor/debugger.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/sourceeditor/debugger.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,241 @@
+/* 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/. */
+
+ "use strict";
+
+const dbginfo = new WeakMap();
+
+// These functions implement search within the debugger. Since
+// search in the debugger is different from other components,
+// we can't use search.js CodeMirror addon. This is a slightly
+// modified version of that addon. Depends on searchcursor.js.
+
+function SearchState() {
+  this.posFrom = this.posTo = this.query = null;
+}
+
+function getSearchState(cm) {
+  return cm.state.search || (cm.state.search = new SearchState());
+}
+
+function getSearchCursor(cm, query, pos) {
+  // If the query string is all lowercase, do a case insensitive search.
+  return cm.getSearchCursor(query, pos,
+    typeof query == "string" && query == query.toLowerCase());
+}
+
+/**
+ * If there's a saved search, selects the next results.
+ * Otherwise, creates a new search and selects the first
+ * result.
+ */
+function doSearch(ctx, rev, query) {
+  let { cm } = ctx;
+  let state = getSearchState(cm);
+
+  if (state.query) {
+    searchNext(ctx, rev);
+    return;
+  }
+
+  cm.operation(function () {
+    if (state.query) return;
+
+    state.query = query;
+    state.posFrom = state.posTo = { line: 0, ch: 0 };
+    searchNext(ctx, rev);
+  });
+}
+
+/**
+ * Selects the next result of a saved search.
+ */
+function searchNext(ctx, rev) {
+  let { cm, ed } = ctx;
+  cm.operation(function () {
+    let state = getSearchState(cm)
+    let cursor = getSearchCursor(cm, state.query, rev ? state.posFrom : state.posTo);
+
+    if (!cursor.find(rev)) {
+      cursor = getSearchCursor(cm, state.query, rev ?
+        { line: cm.lastLine(), ch: null } : { line: cm.firstLine(), ch: 0 });
+      if (!cursor.find(rev))
+        return;
+    }
+
+    ed.alignLine(cursor.from().line, "center");
+    cm.setSelection(cursor.from(), cursor.to());
+    state.posFrom = cursor.from();
+    state.posTo = cursor.to();
+  });
+}
+
+/**
+ * Clears the currently saved search.
+ */
+function clearSearch(cm) {
+  let state = getSearchState(cm);
+
+  if (!state.query)
+    return;
+
+  state.query = null;
+}
+
+// Exported functions
+
+/**
+ * This function is called whenever Editor is extended with functions
+ * from this module. See Editor.extend for more info.
+ */
+function initialize(ctx) {
+  let { ed } = ctx;
+
+  dbginfo.set(ed, {
+    breakpoints:   {},
+    debugLocation: null
+  });
+}
+
+/**
+ * True if editor has a visual breakpoint at that line, false
+ * otherwise.
+ */
+function hasBreakpoint(ctx, line) {
+  let { cm } = ctx;
+  let markers = cm.lineInfo(line).gutterMarkers;
+
+  return markers != null &&
+    markers.breakpoints.classList.contains("breakpoint");
+}
+
+/**
+ * Adds a visual breakpoint for a specified line. Third
+ * parameter 'cond' can hold any object.
+ *
+ * After adding a breakpoint, this function makes Editor to
+ * emit a breakpointAdded event.
+ */
+function addBreakpoint(ctx, line, cond) {
+  if (hasBreakpoint(ctx, line))
+    return;
+
+  let { ed, cm } = ctx;
+  let meta = dbginfo.get(ed);
+  let info = cm.lineInfo(line);
+
+  ed.addMarker(line, "breakpoints", "breakpoint");
+  meta.breakpoints[line] = { condition: cond };
+
+  info.handle.on("delete", function onDelete() {
+    info.handle.off("delete", onDelete);
+    meta.breakpoints[info.line] = null;
+  });
+
+  ed.emit("breakpointAdded", line);
+}
+
+/**
+ * Removes a visual breakpoint from a specified line and
+ * makes Editor to emit a breakpointRemoved event.
+ */
+function removeBreakpoint(ctx, line) {
+  if (!hasBreakpoint(ctx, line))
+    return;
+
+  let { ed, cm } = ctx;
+  let meta = dbginfo.get(ed);
+  let info = cm.lineInfo(line);
+
+  meta.breakpoints[info.line] = null;
+  ed.removeMarker(info.line, "breakpoints", "breakpoint");
+  ed.emit("breakpointRemoved", line);
+}
+
+/**
+ * Returns a list of all breakpoints in the current Editor.
+ */
+function getBreakpoints(ctx) {
+  let { ed } = ctx;
+  let meta = dbginfo.get(ed);
+
+  return Object.keys(meta.breakpoints).reduce((acc, line) => {
+    if (meta.breakpoints[line] != null)
+      acc.push({ line: line, condition: meta.breakpoints[line].condition });
+    return acc;
+  }, []);
+}
+
+/**
+ * Saves a debug location information and adds a visual anchor to
+ * the breakpoints gutter. This is used by the debugger UI to
+ * display the line on which the Debugger is currently paused.
+ */
+function setDebugLocation(ctx, line) {
+  let { ed } = ctx;
+  let meta = dbginfo.get(ed);
+
+  clearDebugLocation(ctx);
+
+  meta.debugLocation = line;
+  ed.addMarker(line, "breakpoints", "debugLocation");
+  ed.addLineClass(line, "debug-line");
+}
+
+/**
+ * Returns a line number that corresponds to the current debug
+ * location.
+ */
+function getDebugLocation(ctx) {
+  let { ed } = ctx;
+  let meta = dbginfo.get(ed);
+
+  return meta.debugLocation;
+}
+
+/**
+ * Clears the debug location. Clearing the debug location
+ * also removes a visual anchor from the breakpoints gutter.
+ */
+function clearDebugLocation(ctx) {
+  let { ed } = ctx;
+  let meta = dbginfo.get(ed);
+
+  if (meta.debugLocation != null) {
+    ed.removeMarker(meta.debugLocation, "breakpoints", "debugLocation");
+    ed.removeLineClass(meta.debugLocation, "debug-line");
+    meta.debugLocation = null;
+  }
+}
+
+/**
+ * Starts a new search.
+ */
+function find(ctx, query) {
+  clearSearch(ctx.cm);
+  doSearch(ctx, false, query);
+}
+
+/**
+ * Finds the next item based on the currently saved search.
+ */
+function findNext(ctx, query) {
+  doSearch(ctx, false, query);
+}
+
+/**
+ * Finds the previous item based on the currently saved search.
+ */
+function findPrev(ctx, query) {
+  doSearch(ctx, true, query);
+}
+
+
+// Export functions
+
+[
+  initialize, hasBreakpoint, addBreakpoint, removeBreakpoint,
+  getBreakpoints, setDebugLocation, getDebugLocation,
+  clearDebugLocation, find, findNext, findPrev
+].forEach(function (func) { module.exports[func.name] = func; });