diff --git a/bookmarks.c b/bookmarks.c
index c4c660c..3df9487 100644
--- a/bookmarks.c
+++ b/bookmarks.c
@@ -27,7 +27,7 @@ zathura_bookmark_add(zathura_t* zathura, const gchar* id, unsigned int page)
       girara_warning("Failed to add bookmark to database.");
     }
   }
-  
+
   return bookmark;
 }
 
@@ -94,4 +94,3 @@ zathura_bookmarks_load(zathura_t* zathura, const gchar* file) {
   return true;
 }
 
-
diff --git a/callbacks.c b/callbacks.c
index aedd9b5..688a866 100644
--- a/callbacks.c
+++ b/callbacks.c
@@ -72,7 +72,7 @@ cb_view_vadjustment_value_changed(GtkAdjustment *adjustment, gpointer data)
       cairo_surface_destroy(page->surface);
       page->surface = NULL;
     }
-    
+
     free(offset);
   }
 }
diff --git a/config.mk b/config.mk
index 7a4d602..1edeeec 100644
--- a/config.mk
+++ b/config.mk
@@ -28,7 +28,7 @@ LIBS = ${GIRARA_LIB} ${GTK_LIB} $(SQLITE_LIB) $(DL_LIB) -lpthread -lm
 CFLAGS += -std=c99 -pedantic -Wall -Wno-format-zero-length -Wextra $(INCS)
 
 # debug
-DFLAGS = -g
+DFLAGS ?= -g
 
 # ld
 LDFLAGS += -rdynamic
diff --git a/database-sqlite.c b/database-sqlite.c
index bdb9d72..1cad534 100644
--- a/database-sqlite.c
+++ b/database-sqlite.c
@@ -15,7 +15,7 @@ zathura_database_t*
 zathura_db_init(const char* path)
 {
   zathura_database_t* db = g_malloc0(sizeof(zathura_database_t));
-  
+
   /* create bookmarks database */
   static const char SQL_BOOKMARK_INIT[] =
     "CREATE TABLE IF NOT EXISTS bookmarks ("
@@ -167,7 +167,7 @@ zathura_db_load_bookmarks(zathura_database_t* db, const char* file)
     zathura_bookmark_t* bookmark = g_malloc0(sizeof(zathura_bookmark_t));
     bookmark->id = g_strdup((const char*) sqlite3_column_text(stmt, 0));
     bookmark->page = sqlite3_column_int(stmt, 1);
-    
+
     girara_list_append(result, bookmark);
   }
   sqlite3_finalize(stmt);
diff --git a/document.c b/document.c
index 3e39d5a..b7955fe 100644
--- a/document.c
+++ b/document.c
@@ -94,8 +94,9 @@ zathura_document_plugins_load(zathura_t* zathura)
         break;
       }
 
-      plugin->file_extension = NULL;
       plugin->open_function  = NULL;
+      plugin->content_types = girara_list_new();
+      girara_list_set_free_function(plugin->content_types, g_free);
 
       register_plugin(plugin);
 
@@ -121,67 +122,55 @@ zathura_document_plugins_load(zathura_t* zathura)
 }
 
 void
-zathura_document_plugins_free(zathura_t* zathura)
+zathura_document_plugin_free(zathura_document_plugin_t* plugin)
 {
-  if (zathura == NULL) {
+  if (plugin == NULL) {
     return;
   }
 
-  girara_list_iterator_t* iter = girara_list_iterator(zathura->plugins.plugins);
-  if (iter == NULL) {
-    return;
-  }
-
-  do {
-    zathura_document_plugin_t* plugin = (zathura_document_plugin_t*) girara_list_iterator_data(iter);
-    free(plugin);
-  } while (girara_list_iterator_next(iter));
-  girara_list_iterator_free(iter);
+  girara_list_free(plugin->content_types);
+  free(plugin);
 }
 
 bool
 zathura_document_plugin_register(zathura_t* zathura, zathura_document_plugin_t* new_plugin, void* handle)
 {
-  if( (new_plugin == NULL) || (new_plugin->file_extension == NULL) || (new_plugin->open_function == NULL)
+  if( (new_plugin == NULL) || (new_plugin->content_types == NULL) || (new_plugin->open_function == NULL)
       || (handle == NULL) ) {
     girara_error("plugin: could not register\n");
     return false;
   }
 
-  /* search existing plugins */
-  girara_list_iterator_t* iter = girara_list_iterator(zathura->plugins.plugins);
-  if (iter) {
-    do {
-      zathura_document_plugin_t* plugin = (zathura_document_plugin_t*) girara_list_iterator_data(iter);
-      if (strcmp(plugin->file_extension, new_plugin->file_extension) == 0) {
-        girara_error("plugin: already registered for filetype %s\n", plugin->file_extension);
-        girara_list_iterator_free(iter);
-        return false;
-      }
-    } while (girara_list_iterator_next(iter));
-    girara_list_iterator_free(iter);
-  }
+  bool atleastone = false;
+  GIRARA_LIST_FOREACH(new_plugin->content_types, gchar*, iter, type)
+    if (!zathura_type_plugin_mapping_new(zathura, type, new_plugin)) {
+      girara_error("plugin: already registered for filetype %s\n", type);
+    }
+    atleastone = true;
+  GIRARA_LIST_FOREACH_END(new_plugin->content_types, gchar*, iter, type)
 
-  girara_list_append(zathura->plugins.plugins, new_plugin);
-  return true;
+  if (atleastone) {
+    girara_list_append(zathura->plugins.plugins, new_plugin);
+  }
+  return atleastone;
 }
 
 zathura_document_t*
 zathura_document_open(zathura_t* zathura, const char* path, const char* password)
 {
   if (path == NULL) {
-    goto error_out;
+    return NULL;
   }
 
   if (file_exists(path) == false) {
     girara_error("File does not exist");
-    goto error_out;
+    return NULL;
   }
 
-  const char* file_extension = file_get_extension(path);
-  if (file_extension == NULL) {
+  const gchar* content_type = g_content_type_guess(path, NULL, 0, NULL);
+  if (content_type == NULL) {
     girara_error("Could not determine file type");
-    goto error_out;
+    return NULL;
   }
 
   /* determine real path */
@@ -199,11 +188,28 @@ zathura_document_open(zathura_t* zathura, const char* path, const char* password
 
   real_path = malloc(sizeof(char) * path_max);
   if (real_path == NULL) {
-    goto error_out;
+    g_free((void*)content_type);
+    return NULL;
   }
 
   if (realpath(path, real_path) == NULL) {
-    goto error_free;
+    g_free((void*)content_type);
+    free(real_path);
+    return NULL;
+  }
+
+  zathura_document_plugin_t* plugin = NULL;
+  GIRARA_LIST_FOREACH(zathura->plugins.type_plugin_mapping, zathura_type_plugin_mapping_t*, iter, mapping)
+    if (g_content_type_equals(content_type, mapping->type)) {
+      plugin = mapping->plugin;
+      break;
+    }
+  GIRARA_LIST_FOREACH_END(zathura->plugins.type_plugin_mapping, zathura_type_plugin_mapping_t*, iter, mapping)
+  g_free((void*)content_type);
+
+  if (plugin == NULL) {
+    girara_error("unknown file type\n");
+    free(real_path);
   }
 
   document = g_malloc0(sizeof(zathura_document_t));
@@ -216,46 +222,31 @@ zathura_document_open(zathura_t* zathura, const char* path, const char* password
   document->scale               = 1.0;
   document->zathura             = zathura;
 
-  girara_list_iterator_t* iter = girara_list_iterator(zathura->plugins.plugins);
-  if (iter == NULL) {
-    goto error_free;
-  }
+  if (plugin->open_function != NULL) {
+    if (plugin->open_function(document) == true) {
+      /* update statusbar */
+      girara_statusbar_item_set_text(zathura->ui.session, zathura->ui.statusbar.file, real_path);
 
-  do {
-    zathura_document_plugin_t* plugin = (zathura_document_plugin_t*) girara_list_iterator_data(iter);
-    if (strcmp(file_extension, plugin->file_extension) == 0) {
-      girara_list_iterator_free(iter);
-      if (plugin->open_function != NULL) {
-        if (plugin->open_function(document) == true) {
-          /* update statusbar */
-          girara_statusbar_item_set_text(zathura->ui.session, zathura->ui.statusbar.file, real_path);
+      /* read all pages */
+      document->pages = calloc(document->number_of_pages, sizeof(zathura_page_t*));
+      if (document->pages == NULL) {
+        goto error_free;
+      }
 
-          /* read all pages */
-          document->pages = calloc(document->number_of_pages, sizeof(zathura_page_t*));
-          if (document->pages == NULL) {
-            goto error_free;
-          }
-
-          for (unsigned int page_id = 0; page_id < document->number_of_pages; page_id++) {
-            zathura_page_t* page = zathura_page_get(document, page_id);
-            if (page == NULL) {
-              goto error_free;
-            }
-
-            document->pages[page_id] = page;
-          }
-
-          return document;
-        } else {
-          girara_error("could not open file\n");
+      for (unsigned int page_id = 0; page_id < document->number_of_pages; page_id++) {
+        zathura_page_t* page = zathura_page_get(document, page_id);
+        if (page == NULL) {
           goto error_free;
         }
-      }
-    }
-  } while (girara_list_iterator_next(iter));
-  girara_list_iterator_free(iter);
 
-  girara_error("unknown file type\n");
+        document->pages[page_id] = page;
+      }
+
+      return document;
+    }
+  }
+
+  girara_error("could not open file\n");
 
 error_free:
 
@@ -270,9 +261,6 @@ error_free:
   }
 
   g_free(document);
-
-error_out:
-
   return NULL;
 }
 
@@ -553,3 +541,33 @@ zathura_image_buffer_free(zathura_image_buffer_t* image_buffer)
   free(image_buffer->data);
   free(image_buffer);
 }
+
+bool
+zathura_type_plugin_mapping_new(zathura_t* zathura, const gchar* type, zathura_document_plugin_t* plugin)
+{
+  g_return_val_if_fail(zathura && type && plugin, false);
+
+  GIRARA_LIST_FOREACH(zathura->plugins.type_plugin_mapping, zathura_type_plugin_mapping_t*, iter, mapping)
+    if (g_content_type_equals(type, mapping->type)) {
+      girara_list_iterator_free(iter);
+      return false;
+    }
+  GIRARA_LIST_FOREACH_END(zathura->plugins.type_plugin_mapping, zathura_type_plugin_mapping_t*, iter, mapping)
+
+  zathura_type_plugin_mapping_t* mapping = g_malloc(sizeof(zathura_type_plugin_mapping_t));
+  mapping->type = g_strdup(type);
+  mapping->plugin = plugin;
+  girara_list_append(zathura->plugins.type_plugin_mapping, mapping);
+  return true;
+}
+
+void
+zathura_type_plugin_mapping_free(zathura_type_plugin_mapping_t* mapping)
+{
+  if (mapping == NULL) {
+    return;
+  }
+
+  g_free((void*)mapping->type);
+  g_free(mapping);
+}
diff --git a/document.h b/document.h
index 557ba1c..181199f 100644
--- a/document.h
+++ b/document.h
@@ -22,11 +22,17 @@ typedef bool (*zathura_document_open_t)(zathura_document_t* document);
  */
 typedef struct zathura_document_plugin_s
 {
-  char* file_extension; /**> File extension */
+  girara_list_t* content_types; /**> List of supported content types */
   zathura_document_open_t open_function; /**> Document open function */
   void* handle; /**> DLL handle */
 } zathura_document_plugin_t;
 
+typedef struct zathura_type_plugin_mapping_s
+{
+  const gchar* type;
+  zathura_document_plugin_t* plugin;
+} zathura_type_plugin_mapping_t;
+
 /**
  * Function prototype that is called to register a document plugin
  *
@@ -239,11 +245,11 @@ struct zathura_document_s
 void zathura_document_plugins_load(zathura_t* zathura);
 
 /**
- * Free all document plugins
+ * Free a document plugin
  *
- * @param zathura the zathura session
+ * @param plugin The plugin
  */
-void zathura_document_plugins_free(zathura_t* zathura);
+void zathura_document_plugin_free(zathura_document_plugin_t* plugin);
 
 /**
  * Register document plugin
@@ -383,4 +389,20 @@ zathura_index_element_t* zathura_index_element_new(const char* title);
  */
 void zathura_index_element_free(zathura_index_element_t* index);
 
+/**
+ * Add type -> plugin mapping
+ * @param zathura zathura instance
+ * @param type content type
+ * @param plugin plugin instance
+ * @return true on success, false if another plugin is already registered for
+ * that type
+ */
+bool zathura_type_plugin_mapping_new(zathura_t* zathura, const gchar* type, zathura_document_plugin_t* plugin);
+
+/**
+ * Free type -> plugin mapping
+ * @param mapping To be freed
+ */
+void zathura_type_plugin_mapping_free(zathura_type_plugin_mapping_t* mapping);
+
 #endif // DOCUMENT_H
diff --git a/print.c b/print.c
index bf57f5b..4d84982 100644
--- a/print.c
+++ b/print.c
@@ -17,7 +17,7 @@ print(zathura_t* zathura)
   if (zathura->print.page_setup != NULL) {
     gtk_print_operation_set_default_page_setup(print_operation, zathura->print.page_setup);
   }
-  
+
   gtk_print_operation_set_allow_async(print_operation, TRUE);
   gtk_print_operation_set_n_pages(print_operation, zathura->document->number_of_pages);
   gtk_print_operation_set_current_page(print_operation, zathura->document->current_page_number);
diff --git a/utils.c b/utils.c
index 45bd735..53de7d2 100644
--- a/utils.c
+++ b/utils.c
@@ -55,26 +55,21 @@ file_valid_extension(zathura_t* zathura, const char* path)
     return false;
   }
 
-  const char* file_extension = file_get_extension(path);
-
-  if (file_extension == NULL) {
+  const gchar* content_type = g_content_type_guess(path, NULL, 0, NULL);
+  if (content_type == NULL) {
     return false;
   }
 
-  girara_list_iterator_t* iter = girara_list_iterator(zathura->plugins.plugins);
-  if (iter == NULL) {
-    return false;
-  }
-
-  do {
-    zathura_document_plugin_t* plugin = (zathura_document_plugin_t*) girara_list_iterator_data(iter);
-    if (!strcmp(file_extension, plugin->file_extension)) {
-      return true;
+  bool result = false;
+  GIRARA_LIST_FOREACH(zathura->plugins.type_plugin_mapping, zathura_type_plugin_mapping_t*, iter, mapping)
+    if (g_content_type_equals(content_type, mapping->type)) {
+      result = true;
+      break;
     }
-  } while (girara_list_iterator_next(iter));
-  girara_list_iterator_free(iter);
+  GIRARA_LIST_FOREACH_END(zathura->plugins.type_plugin_mapping, zathura_type_plugin_mapping_t*, iter, mapping)
 
-  return false;
+  g_free(content_type);
+  return result;
 }
 
 bool
diff --git a/zathura.c b/zathura.c
index 6a8a75b..287b9fb 100644
--- a/zathura.c
+++ b/zathura.c
@@ -30,7 +30,7 @@ zathura_init(int argc, char* argv[])
   /* parse command line options */
   GdkNativeWindow embed = 0;
   gchar* config_dir = NULL, *data_dir = NULL, *plugin_path = NULL;
-  GOptionEntry entries[] = 
+  GOptionEntry entries[] =
   {
     { "reparent",    'e', 0, G_OPTION_ARG_INT,      &embed,       "Reparents to window specified by xid",       "xid"  },
     { "config-dir",  'c', 0, G_OPTION_ARG_FILENAME, &config_dir,  "Path to the config directory",               "path" },
@@ -63,8 +63,11 @@ zathura_init(int argc, char* argv[])
 
   /* plugins */
   zathura->plugins.plugins = girara_list_new();
+  girara_list_set_free_function(zathura->plugins.plugins, zathura_document_plugin_free);
   zathura->plugins.path    = girara_list_new();
   girara_list_set_free_function(zathura->plugins.path, g_free);
+  zathura->plugins.type_plugin_mapping = girara_list_new();
+  girara_list_set_free_function(zathura->plugins.type_plugin_mapping, zathura_type_plugin_mapping_free);
 
   if (config_dir) {
     zathura->config.config_dir = g_strdup(config_dir);
@@ -263,7 +266,6 @@ zathura_free(zathura_t* zathura)
   }
 
   /* free registered plugins */
-  zathura_document_plugins_free(zathura);
   girara_list_free(zathura->plugins.plugins);
   girara_list_free(zathura->plugins.path);
 
diff --git a/zathura.h b/zathura.h
index 7035542..163d094 100644
--- a/zathura.h
+++ b/zathura.h
@@ -69,6 +69,7 @@ typedef struct zathura_s
   {
     girara_list_t* plugins; /**> List of plugins */
     girara_list_t* path; /**> List of plugin paths */
+    girara_list_t* type_plugin_mapping; /**> List of type -> plugin mappings */
   } plugins;
 
   struct