diff --git a/common/content/autocommands.js b/common/content/autocommands.js
index 29a12cc3..3cc58c9a 100644
--- a/common/content/autocommands.js
+++ b/common/content/autocommands.js
@@ -191,7 +191,7 @@ const AutoCommands = Module("autocommands", {
                 options: [
                     {
                         names: ["-javascript", "-js"],
-                        description: "Interperate the action as JavaScript code rather than an ex command"
+                        description: "Interpret the action as JavaScript code rather than an Ex command"
                     }
                 ]
             });
diff --git a/common/content/commandline.js b/common/content/commandline.js
index 1e7b81d3..d3f21513 100644
--- a/common/content/commandline.js
+++ b/common/content/commandline.js
@@ -283,7 +283,7 @@ const CommandLine = Module("commandline", {
         // we need to save the mode which were in before opening the command line
         // this is then used if we focus the command line again without the "official"
         // way of calling "open"
-        this.currentExtendedMode = null; // the extended mode which we last openend the command line for
+        this.currentExtendedMode = null; // the extended mode which we last opened the command line for
 
         // save the arguments for the inputMultiline method which are needed in the event handler
         this._multilineEnd = null;
diff --git a/common/content/commands.js b/common/content/commands.js
index 54c66da8..71301398 100644
--- a/common/content/commands.js
+++ b/common/content/commands.js
@@ -1277,7 +1277,7 @@ const Commands = Module("commands", {
                 },
                 options: [
                     { names: ["-bang", "-b"],  description: "Command may be proceeded by a !" },
-                    { names: ["-count", "-c"], description: "Command may be preceeded by a count" },
+                    { names: ["-count", "-c"], description: "Command may be proceeded by a count" },
                     {
                         // TODO: "E180: invalid complete value: " + arg
                         names: ["-complete", "-C"],
diff --git a/common/content/dactyl.js b/common/content/dactyl.js
index 7339b9f2..cc15de02 100644
--- a/common/content/dactyl.js
+++ b/common/content/dactyl.js
@@ -1414,7 +1414,7 @@ const Dactyl = Module("dactyl", {
             };
 
         const addonErrors = array.toObject([
-            [AddonManager.ERROR_NETWORK_FAILURE, "A network error occured"],
+            [AddonManager.ERROR_NETWORK_FAILURE, "A network error occurred"],
             [AddonManager.ERROR_INCORRECT_HASH,  "The downloaded file did not match the expected hash"],
             [AddonManager.ERROR_CORRUPT_FILE,    "The file appears to be corrupt"],
             [AddonManager.ERROR_FILE_ACCESS,     "There was an error accessing the filesystem"]]);
diff --git a/common/content/options.js b/common/content/options.js
index a9439a62..d895acad 100644
--- a/common/content/options.js
+++ b/common/content/options.js
@@ -30,7 +30,7 @@ let ValueError = Class("ValueError", Error);
  *         privateData - see {@link Option#privateData}
  *         scope       - see {@link Option#scope}
  *         setter      - see {@link Option#setter}
- *         valdator    - see {@link Option#validator}
+ *         vaildator   - see {@link Option#validator}
  * @optional
  * @private
  */
diff --git a/common/content/statusline.js b/common/content/statusline.js
index 60149aba..93ec3887 100644
--- a/common/content/statusline.js
+++ b/common/content/statusline.js
@@ -80,7 +80,7 @@ const StatusLine = Module("statusline", {
             // 1. decodeURI decodes %25 to %, which creates unintended
             //    encoding sequences.
             url = url.split("%25").map(function (url) {
-                    // Non-UTF-8 complient URLs cause "malformed URI sequence" errors.
+                    // Non-UTF-8 compliant URLs cause "malformed URI sequence" errors.
                     try {
                         return decodeURI(url);
                     }
diff --git a/common/content/tabs.js b/common/content/tabs.js
index f46b0268..9109c07d 100644
--- a/common/content/tabs.js
+++ b/common/content/tabs.js
@@ -404,7 +404,7 @@ const Tabs = Module("tabs", {
      * @param {boolean} allowNonUnique Whether to select the first of
      *     multiple matches.
      * @param {number} count If there are multiple matches select the
-     *     count'th match.
+     *     *count*th match.
      * @param {boolean} reverse Whether to search the buffer list in
      *     reverse order.
      *
diff --git a/common/modules/base.jsm b/common/modules/base.jsm
index ba76fa04..711b30e3 100644
--- a/common/modules/base.jsm
+++ b/common/modules/base.jsm
@@ -752,7 +752,7 @@ Class.extend = function extend(subclass, superclass, overrides) {
 }
 
 /**
- * Memoizes the value of a class property to the falue returned by
+ * Memoizes the value of a class property to the value returned by
  * the passed function the first time the property is accessed.
  *
  * @param {function(string)} getter The function which returns the
diff --git a/common/modules/util.jsm b/common/modules/util.jsm
index 8b96e031..a2893e6d 100644
--- a/common/modules/util.jsm
+++ b/common/modules/util.jsm
@@ -542,7 +542,7 @@ const Util = Module("Util", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference])
      * Returns true if *host* is a subdomain of *domain*.
      *
      * @param {string} host The host to check.
-     * @param {string} domain The base domain to check the host agains.
+     * @param {string} domain The base domain to check the host against.
      * @returns {boolean}
      */
     isSubdomain: function isSubdomain(host, domain) {