diff --git a/src/lib/adblock/adblockmanager.cpp b/src/lib/adblock/adblockmanager.cpp
index a98bee19b..5a7242902 100644
--- a/src/lib/adblock/adblockmanager.cpp
+++ b/src/lib/adblock/adblockmanager.cpp
@@ -287,7 +287,9 @@ bool AdBlockManager::isEnabled()
 
 bool AdBlockManager::canRunOnScheme(const QString &scheme) const
 {
-    return !(scheme == "file" || scheme == "qrc" || scheme == "qupzilla" || scheme == "data" || scheme == "abp");
+    return !(scheme == QLatin1String("file") || scheme == QLatin1String("qrc")
+             || scheme == QLatin1String("qupzilla") || scheme == QLatin1String("data")
+             || scheme == QLatin1String("abp"));
 }
 
 bool AdBlockManager::canBeBlocked(const QUrl &url) const
diff --git a/src/plugins/GreaseMonkey/gm_manager.cpp b/src/plugins/GreaseMonkey/gm_manager.cpp
index 0b6ff0f29..6ba67a9e9 100644
--- a/src/plugins/GreaseMonkey/gm_manager.cpp
+++ b/src/plugins/GreaseMonkey/gm_manager.cpp
@@ -237,5 +237,6 @@ void GM_Manager::load()
 
 bool GM_Manager::canRunOnScheme(const QString &scheme)
 {
-    return (scheme == "http" || scheme == "https" || scheme == "data" || scheme == "ftp");
+    return (scheme == QLatin1String("http") || scheme == QLatin1String("https")
+            || scheme == QLatin1String("data") || scheme == QLatin1String("ftp"));
 }
diff --git a/src/plugins/GreaseMonkey/gm_plugin.cpp b/src/plugins/GreaseMonkey/gm_plugin.cpp
index 81c59cd33..0fac6e305 100644
--- a/src/plugins/GreaseMonkey/gm_plugin.cpp
+++ b/src/plugins/GreaseMonkey/gm_plugin.cpp
@@ -38,7 +38,7 @@ PluginSpec GM_Plugin::pluginSpec()
     spec.name = "GreaseMonkey";
     spec.info = "Userscripts for QupZilla";
     spec.description = "Provides support for userscripts (www.userscripts.org)";
-    spec.version = "0.2.1";
+    spec.version = "0.2.2";
     spec.author = "David Rosca <nowrep@gmail.com>";
     spec.icon = QPixmap(":gm/data/icon.png");
     spec.hasSettings = true;
@@ -62,7 +62,7 @@ void GM_Plugin::unload()
 
 bool GM_Plugin::testPlugin()
 {
-    return (QupZilla::VERSION == "1.3.1");
+    return (QupZilla::VERSION == QLatin1String("1.3.1"));
 }
 
 QTranslator* GM_Plugin::getTranslator(const QString &locale)
diff --git a/src/plugins/GreaseMonkey/gm_script.cpp b/src/plugins/GreaseMonkey/gm_script.cpp
index 18507c6f4..56425b4d9 100644
--- a/src/plugins/GreaseMonkey/gm_script.cpp
+++ b/src/plugins/GreaseMonkey/gm_script.cpp
@@ -162,12 +162,12 @@ void GM_Script::parseScript(const QString &filePath)
 
     const QStringList &lines = metadataBlock.split('\n');
     foreach(QString line, lines) {
-        if (!line.startsWith("// @")) {
+        if (!line.startsWith(QLatin1String("// @"))) {
             continue;
         }
 
-        line = line.mid(3).replace('\t', ' ');
-        int index = line.indexOf(' ');
+        line = line.mid(3).replace(QLatin1Char('\t'), QLatin1Char(' '));
+        int index = line.indexOf(QLatin1Char(' '));
 
         if (index < 0) {
             continue;
@@ -184,39 +184,39 @@ void GM_Script::parseScript(const QString &filePath)
             continue;
         }
 
-        if (key == "@name") {
+        if (key == QLatin1String("@name")) {
             m_name = value;
         }
-        else if (key == "@namespace") {
+        else if (key == QLatin1String("@namespace")) {
             m_namespace = value;
         }
-        else if (key == "@description") {
+        else if (key == QLatin1String("@description")) {
             m_description = value;
         }
-        else if (key == "@version") {
+        else if (key == QLatin1String("@version")) {
             m_version = value;
         }
-        else if (key == "@updateURL") {
+        else if (key == QLatin1String("@updateURL")) {
             m_downloadUrl = QUrl(value);
         }
-        else if (key == "@include" || key == "@match") {
+        else if (key == QLatin1String("@include") || key == QLatin1String("@match")) {
             m_include.append(GM_UrlMatcher(value));
         }
-        else if (key == "@exclude" || key == "@exclude_match") {
+        else if (key == QLatin1String("@exclude") || key == QLatin1String("@exclude_match")) {
             m_exclude.append(GM_UrlMatcher(value));
         }
-        else if (key == "@require") {
+        else if (key == QLatin1String("@require")) {
             requireList.append(value);
         }
-        else if (key == "@run-at") {
-            if (value == "document-end") {
+        else if (key == QLatin1String("@run-at")) {
+            if (value == QLatin1String("document-end")) {
                 m_startAt = DocumentEnd;
             }
-            else if (value == "document-start") {
+            else if (value == QLatin1String("document-start")) {
                 m_startAt = DocumentStart;
             }
         }
-        else if (key == "@downloadURL" && m_downloadUrl.isEmpty()) {
+        else if (key == QLatin1String("@downloadURL") && m_downloadUrl.isEmpty()) {
             m_downloadUrl = QUrl(value);
         }
     }
@@ -225,7 +225,7 @@ void GM_Script::parseScript(const QString &filePath)
         m_include.append(GM_UrlMatcher("*"));
     }
 
-    int index = fileData.indexOf("// ==/UserScript==") + 18;
+    int index = fileData.indexOf(QLatin1String("// ==/UserScript==")) + 18;
     QString script = fileData.mid(index).trimmed();
 
     script.prepend(m_manager->requireScripts(requireList));
diff --git a/src/plugins/GreaseMonkey/gm_urlmatcher.cpp b/src/plugins/GreaseMonkey/gm_urlmatcher.cpp
index c5f24502f..baa0c1cca 100644
--- a/src/plugins/GreaseMonkey/gm_urlmatcher.cpp
+++ b/src/plugins/GreaseMonkey/gm_urlmatcher.cpp
@@ -25,10 +25,10 @@ bool wildcardMatch(const QString &string, const QString &pattern)
     int stringSize = string.size();
     int patternSize = pattern.size();
 
-    bool startsWithWildcard = pattern[0] == '*';
-    bool endsWithWildcard = pattern[patternSize - 1] == '*';
+    bool startsWithWildcard = pattern[0] == QLatin1Char('*');
+    bool endsWithWildcard = pattern[patternSize - 1] == QLatin1Char('*');
 
-    const QStringList &parts = pattern.split('*');
+    const QStringList &parts = pattern.split(QLatin1Char('*'));
     int pos = 0;
 
     if (startsWithWildcard) {
@@ -76,7 +76,7 @@ bool GM_UrlMatcher::match(const QString &urlString) const
 
 void GM_UrlMatcher::parsePattern(QString pattern)
 {
-    if (pattern.startsWith('/') && pattern.endsWith('/')) {
+    if (pattern.startsWith(QLatin1Char('/')) && pattern.endsWith(QLatin1Char('/'))) {
         pattern = pattern.mid(1);
         pattern = pattern.left(pattern.size() - 1);
 
@@ -85,14 +85,14 @@ void GM_UrlMatcher::parsePattern(QString pattern)
         return;
     }
 
-    if (pattern.contains(".tld")) {
+    if (pattern.contains(QLatin1String(".tld"))) {
 
-        pattern.replace(QRegExp("(\\W)"), "\\\\1")
-        .replace(QRegExp("\\*+"), "*")
-        .replace(QRegExp("^\\\\\\|"), "^")
-        .replace(QRegExp("\\\\\\|$"), "$")
-        .replace(QRegExp("\\\\\\*"), ".*")
-        .replace("\\.tld", "\\.[a-z.]{2,6}");
+        pattern.replace(QRegExp("(\\W)"), QLatin1String("\\\\1"))
+        .replace(QRegExp("\\*+"), QLatin1String("*"))
+        .replace(QRegExp("^\\\\\\|"), QLatin1String("^"))
+        .replace(QRegExp("\\\\\\|$"), QLatin1String("$"))
+        .replace(QRegExp("\\\\\\*"), QLatin1String(".*"))
+        .replace("\\.tld", QLatin1String("\\.[a-z.]{2,6}"));
 
         m_useRegExp = true;
         m_regExp = QRegExp(pattern, Qt::CaseInsensitive);