diff --git a/frontends/etiquette_flask/static/js/common.js b/frontends/etiquette_flask/static/js/common.js
index 666236d..9f425d7 100644
--- a/frontends/etiquette_flask/static/js/common.js
+++ b/frontends/etiquette_flask/static/js/common.js
@@ -164,7 +164,7 @@ function init_atag_merge_params()
     */
     page_params = new URLSearchParams(window.location.search);
     let as = Array.from(document.getElementsByClassName("merge_params"));
-    for (let a of as)
+    for (const a of as)
     {
         let a_params = new URLSearchParams(a.search);
         let new_params = new URLSearchParams();
@@ -206,7 +206,7 @@ function init_button_with_confirm()
         data-holder-class: CSS class for the new span that holds the menu.
     */
     let buttons = Array.from(document.getElementsByClassName("button_with_confirm"));
-    for (let button of buttons)
+    for (const button of buttons)
     {
         button.classList.remove("button_with_confirm");
 
@@ -314,7 +314,7 @@ function init_enable_on_pageload()
     class "enable_on_pageload".
     */
     let elements = Array.from(document.getElementsByClassName("enable_on_pageload"));
-    for (let element of elements)
+    for (const element of elements)
     {
         element.disabled = false;
         element.classList.remove("enable_on_pageload");
@@ -334,7 +334,7 @@ function init_tabbed_container()
         let tab_id = tab_button.dataset.tabId;
         let tab_buttons = tab_button.parentElement.getElementsByClassName("tab_button");
         let tabs = tab_button.parentElement.parentElement.getElementsByClassName("tab");
-        for (let tab_button of tab_buttons)
+        for (const tab_button of tab_buttons)
         {
             if (tab_button.dataset.tabId === tab_id)
             {
@@ -347,7 +347,7 @@ function init_tabbed_container()
                 tab_button.classList.add("tab_button_inactive");
             }
         }
-        for (let tab of tabs)
+        for (const tab of tabs)
         {
             if (tab.dataset.tabId === tab_id)
                 { tab.classList.remove("hidden"); }
@@ -357,13 +357,13 @@ function init_tabbed_container()
     }
 
     let tabbed_containers = Array.from(document.getElementsByClassName("tabbed_container"));
-    for (let tabbed_container of tabbed_containers)
+    for (const tabbed_container of tabbed_containers)
     {
         let button_container = document.createElement("div");
         button_container.className = "tab_buttons";
         tabbed_container.prepend(button_container);
         let tabs = Array.from(tabbed_container.getElementsByClassName("tab"));
-        for (let tab of tabs)
+        for (const tab of tabs)
         {
             tab.classList.add("hidden");
             let tab_id = tab.dataset.tabId || tab.dataset.tabTitle;
diff --git a/frontends/etiquette_flask/static/js/editor.js b/frontends/etiquette_flask/static/js/editor.js
index f196e17..7f6ad5a 100644
--- a/frontends/etiquette_flask/static/js/editor.js
+++ b/frontends/etiquette_flask/static/js/editor.js
@@ -41,7 +41,7 @@ function Editor(elements, on_open, on_save, on_cancel)
 
     this.close = function()
     {
-        for (var index = 0; index < this.display_elements.length; index += 1)
+        for (let index = 0; index < this.display_elements.length; index += 1)
         {
             this.display_elements[index].classList.remove("hidden");
             this.edit_elements[index].classList.add("hidden");
@@ -65,7 +65,7 @@ function Editor(elements, on_open, on_save, on_cancel)
 
     this.open = function()
     {
-        for (var index = 0; index < this.display_elements.length; index += 1)
+        for (let index = 0; index < this.display_elements.length; index += 1)
         {
             let display_element = this.display_elements[index];
             let edit_element = this.edit_elements[index];
@@ -90,7 +90,7 @@ function Editor(elements, on_open, on_save, on_cancel)
 
     this.save = function()
     {
-        for (var index = 0; index < this.display_elements.length; index += 1)
+        for (let index = 0; index < this.display_elements.length; index += 1)
         {
             let display_element = this.display_elements[index];
             let edit_element = this.edit_elements[index];
@@ -130,9 +130,8 @@ function Editor(elements, on_open, on_save, on_cancel)
 
     this.misc_data = {};
 
-    for (var index = 0; index < elements.length; index += 1)
+    for (const display_element of elements)
     {
-        let display_element = elements[index];
         let edit_element;
         if (editor.PARAGRAPH_TYPES.has(display_element.tagName))
         {
@@ -203,9 +202,9 @@ function Editor(elements, on_open, on_save, on_cancel)
     }
 
     let placeholders = document.getElementsByClassName("editor_toolbox_placeholder");
-    for (var index = 0; index < placeholders.length; index += 1)
+    for (const placeholder of placeholders)
     {
-        placeholders[index].parentElement.removeChild(placeholders[index]);
+        placeholder.parentElement.removeChild(placeholder);
     }
 
     let last_element = this.edit_elements[this.edit_elements.length - 1];
@@ -252,9 +251,8 @@ function Editor(elements, on_open, on_save, on_cancel)
     this.spinner = new spinner.Spinner(spinner_element);
     toolbox.appendChild(spinner_element);
 
-    for (var index = 0; index < this.edit_elements.length; index += 1)
+    for (const edit_element of this.edit_elements)
     {
-        let edit_element = this.edit_elements[index];
         if (edit_element.tagName == "TEXTAREA")
         {
             common.bind_box_to_button(edit_element, this.save_button, true);
diff --git a/frontends/etiquette_flask/static/js/hotkeys.js b/frontends/etiquette_flask/static/js/hotkeys.js
index ce91a4f..8759513 100644
--- a/frontends/etiquette_flask/static/js/hotkeys.js
+++ b/frontends/etiquette_flask/static/js/hotkeys.js
@@ -59,7 +59,7 @@ function show_all_hotkeys()
 {
     // Display an Alert with a list of all the hotkeys.
     let lines = [];
-    for (var identifier in hotkeys.HOTKEYS)
+    for (const identifier in hotkeys.HOTKEYS)
     {
         let line = hotkeys.HOTKEYS[identifier]["human"] + " :  " + hotkeys.HOTKEYS[identifier]["description"];
         lines.push(line);
diff --git a/frontends/etiquette_flask/static/js/photo_clipboard.js b/frontends/etiquette_flask/static/js/photo_clipboard.js
index 803962f..c567faa 100644
--- a/frontends/etiquette_flask/static/js/photo_clipboard.js
+++ b/frontends/etiquette_flask/static/js/photo_clipboard.js
@@ -30,9 +30,9 @@ function load_clipboard(event)
         photo_clipboard.clipboard = new Set(JSON.parse(stored));
     }
 
-    for (var index = 0; index < photo_clipboard.on_load_hooks.length; index += 1)
+    for (const on_load_hook of photo_clipboard.on_load_hooks)
     {
-        photo_clipboard.on_load_hooks[index]();
+        on_load_hook();
     }
 
     return photo_clipboard.clipboard;
@@ -46,9 +46,9 @@ function save_clipboard()
     localStorage.setItem("photo_clipboard", serialized);
     photo_clipboard.update_pagestate();
 
-    for (var index = 0; index < photo_clipboard.on_save_hooks.length; index += 1)
+    for (const on_save_hook of photo_clipboard.on_save_hooks)
     {
-        photo_clipboard.on_save_hooks[index]();
+        on_save_hook();
     }
 }
 
@@ -212,14 +212,14 @@ function ingest_toolbox_items()
     */
     let toolbox = document.getElementById("clipboard_tray_toolbox");
     let moreboxes = document.getElementsByClassName("my_clipboard_tray_toolbox");
-    for (var i = 0; i < moreboxes.length; i += 1)
+
+    for (const morebox of moreboxes)
     {
-        let box = moreboxes[i];
-        while (box.firstElementChild)
+        while (morebox.firstElementChild)
         {
-            toolbox.appendChild(box.firstElementChild);
+            toolbox.appendChild(morebox.firstElementChild);
         }
-        box.parentElement.removeChild(box);
+        morebox.parentElement.removeChild(morebox);
     }
 }
 
@@ -258,11 +258,11 @@ function update_clipboard_tray()
         common.delete_all_children(tray_lines);
         let photo_ids = Array.from(photo_clipboard.clipboard);
         photo_ids.sort();
-        for (var i = 0; i < photo_ids.length; i += 1)
+        for (const photo_id of photo_ids)
         {
             let clipboard_line = document.createElement("div");
             clipboard_line.classList.add("clipboard_tray_line");
-            clipboard_line.dataset.id = photo_ids[i];
+            clipboard_line.dataset.id = photo_id;
 
             let clipboard_line_delete_button = document.createElement("button");
             clipboard_line_delete_button.classList.add("remove_tag_button_perm");
@@ -271,8 +271,8 @@ function update_clipboard_tray()
 
             let clipboard_line_link = document.createElement("a");
             clipboard_line_link.target = "_blank";
-            clipboard_line_link.href = "/photo/" + photo_ids[i];
-            clipboard_line_link.innerText = photo_ids[i];
+            clipboard_line_link.href = "/photo/" + photo_id;
+            clipboard_line_link.innerText = photo_id;
 
             clipboard_line.appendChild(clipboard_line_delete_button);
             clipboard_line.appendChild(clipboard_line_link);
@@ -293,9 +293,9 @@ photo_clipboard.update_clipboard_count =
 function update_clipboard_count()
 {
     let elements = document.getElementsByClassName("clipboard_count");
-    for (var index = 0; index < elements.length; index += 1)
+    for (const element of elements)
     {
-        elements[index].innerText = photo_clipboard.clipboard.size;
+        element.innerText = photo_clipboard.clipboard.size;
     }
 }
 
diff --git a/frontends/etiquette_flask/static/js/spinner.js b/frontends/etiquette_flask/static/js/spinner.js
index 587777e..4a2f34a 100644
--- a/frontends/etiquette_flask/static/js/spinner.js
+++ b/frontends/etiquette_flask/static/js/spinner.js
@@ -54,7 +54,7 @@ function close_grouped_spinners(group_id)
     if (group_id && !(spinner.spinner_group_closing[group_id]))
     {
         spinner.spinner_group_closing[group_id] = true;
-        for (let button of spinner.button_spinner_groups[group_id])
+        for (const button of spinner.button_spinner_groups[group_id])
         {
             window[button.dataset.spinnerCloser]();
         }
@@ -65,7 +65,7 @@ function close_grouped_spinners(group_id)
 spinner.open_grouped_spinners =
 function open_grouped_spinners(group_id)
 {
-    for (let button of spinner.button_spinner_groups[group_id])
+    for (const button of spinner.button_spinner_groups[group_id])
     {
         window[button.dataset.spinnerOpener]();
     }
diff --git a/frontends/etiquette_flask/static/js/tag_autocomplete.js b/frontends/etiquette_flask/static/js/tag_autocomplete.js
index 42e523f..29b61e9 100644
--- a/frontends/etiquette_flask/static/js/tag_autocomplete.js
+++ b/frontends/etiquette_flask/static/js/tag_autocomplete.js
@@ -17,13 +17,13 @@ function init_datalist()
     }
 
     common.delete_all_children(datalist);
-    for (var index = 0; index < tag_autocomplete.tagset["tags"].length; index += 1)
+    for (const tag_name of tag_autocomplete.tagset["tags"])
     {
         let option = document.createElement("option");
-        option.value = tag_autocomplete.tagset["tags"][index];
+        option.value = tag_name;
         datalist.appendChild(option);
     }
-    for (var synonym in tag_autocomplete.tagset["synonyms"])
+    for (const synonym in tag_autocomplete.tagset["synonyms"])
     {
         let option = document.createElement("option");
         option.value = tag_autocomplete.tagset["synonyms"][synonym] + "+" + synonym;
diff --git a/frontends/etiquette_flask/templates/bookmarks.html b/frontends/etiquette_flask/templates/bookmarks.html
index 0c33aea..4089c4c 100644
--- a/frontends/etiquette_flask/templates/bookmarks.html
+++ b/frontends/etiquette_flask/templates/bookmarks.html
@@ -148,9 +148,8 @@ on_cancel = undefined;
 function create_editors()
 {
     let cards = document.getElementsByClassName("bookmark_card");
-    for (var index = 0; index < cards.length; index += 1)
+    for (const card of cards)
     {
-        let card = cards[index];
         let title_div = card.getElementsByClassName("bookmark_title")[0];
         let url_div = card.getElementsByClassName("bookmark_url")[0];
         ed = new editor.Editor([title_div, url_div], on_open, on_save, on_cancel);
diff --git a/frontends/etiquette_flask/templates/clipboard.html b/frontends/etiquette_flask/templates/clipboard.html
index 808fe7a..7020e55 100644
--- a/frontends/etiquette_flask/templates/clipboard.html
+++ b/frontends/etiquette_flask/templates/clipboard.html
@@ -165,7 +165,7 @@ function recalculate_needed()
     divs is in `request_more_divs`.
     */
     needed = new Set();
-    for (let photo_id of photo_clipboard.clipboard)
+    for (const photo_id of photo_clipboard.clipboard)
     {
         if (!(photo_id in divs))
         {
@@ -180,7 +180,7 @@ function refresh_divs()
     Add new divs to the page, and remove divs which the user has removed from
     their clipboard.
     */
-    for (let photo_id of divs)
+    for (const photo_id in divs)
     {
         let photo_div = divs[photo_id];
         let should_keep = photo_clipboard.clipboard.has(photo_id);
diff --git a/frontends/etiquette_flask/templates/search.html b/frontends/etiquette_flask/templates/search.html
index 61a9541..71d3ae4 100644
--- a/frontends/etiquette_flask/templates/search.html
+++ b/frontends/etiquette_flask/templates/search.html
@@ -433,9 +433,8 @@ function remove_searchtag(ul, value, inputted_list)
     console.log("removing " + value);
     let lis = ul.children;
     //console.log(lis);
-    for (var index = 0; index < lis.length; index += 1)
+    for (const li of lis)
     {
-        let li = lis[index];
         let tag_object = li.children[0];
         if (! tag_object.classList.contains("tag_object"))
         {continue}
@@ -496,9 +495,8 @@ function orderby_hide_direction_hook(event)
 function simplify_tagnames(tags)
 {
     let new_tags = [];
-    for (var index = 0; index < tags.length; index += 1)
+    for (const tag of tags)
     {
-        let tag = tags[index];
         tag = tag.split(".");
         tag = tag[tag.length - 1];
         new_tags.push(tag);
@@ -540,9 +538,9 @@ function submit_search()
     }
 
     let basic_inputs = document.getElementsByClassName("basic_param");
-    for (var index = 0; index < basic_inputs.length; index += 1)
+    for (const basic_input of basic_inputs)
     {
-        let boxname = basic_inputs[index].name;
+        let boxname = basic_input.name;
         let box = document.getElementsByName(boxname)[0];
         let value = box.value;
         value = value.split("&").join("%26");
@@ -561,17 +559,16 @@ function submit_search()
 
     orderby_rows = document.getElementsByClassName("search_builder_orderby_li");
     orderby_params = [];
-    for (var index = 0; index < orderby_rows.length; index += 1)
+    for (const orderby_row of orderby_rows)
     {
-        let row = orderby_rows[index];
-        let column = row.children[0].value;
+        let column = orderby_row.children[0].value;
         if (column == "random")
         {
             orderby_params.push(column);
         }
         else
         {
-            let sorter = row.children[1].value;
+            let sorter = orderby_row.children[1].value;
             orderby_params.push(column + "-" + sorter);
         }
     }
diff --git a/frontends/etiquette_flask/templates/tags.html b/frontends/etiquette_flask/templates/tags.html
index a6d7a4e..614b982 100644
--- a/frontends/etiquette_flask/templates/tags.html
+++ b/frontends/etiquette_flask/templates/tags.html
@@ -253,7 +253,7 @@ function tag_action_callback(response)
     {
         datas = [datas];
     }
-    for (var index = 0; index < datas.length; index += 1)
+    for (const data of datas)
     {
         let tagname = data.tagname;
         let message_positivity;