diff --git a/src/constants.ts b/src/constants.ts
index 162b5a0..6eed942 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -1,22 +1,70 @@
+const GITHUB_SELECTORS = {
+	row: [
+		'.js-navigation-container[role=grid] > .js-navigation-item',
+		'file-tree .ActionList-content',
+		'a.tree-browser-result',
+		'.PRIVATE_TreeView-item-content',
+		'.react-directory-filename-column',
+		'[aria-label="Parent directory"]',
+	],
+	filename: [
+		'div[role="rowheader"] > span',
+		'.ActionList-item-label',
+		'a.tree-browser-result > marked-text',
+		'.PRIVATE_TreeView-item-content > .PRIVATE_TreeView-item-content-text',
+		'.react-directory-filename-column .react-directory-filename-cell a',
+		'[aria-label="Parent directory"] div',
+	],
+	icon: [
+		'.octicon-file',
+		'.octicon-file-directory-fill',
+		'.octicon-file-directory-open-fill',
+		'.octicon-file-submodule',
+		'.react-directory-filename-column > svg',
+		'[aria-label="Parent directory"] svg',
+	],
+};
+
+const GITLAB_SELECTORS = {
+	row: [
+		'.tree-table .tree-item',
+		'.file-header-content',
+		'.diff-tree-list .file-row',
+	],
+	filename: [
+		'.tree-item-file-name .tree-item-link span:last-of-type',
+		'.file-title-name',
+		'span.gl-truncate-component',
+	],
+	icon: [
+		'.folder-icon',
+		'.file-icon',
+		'span svg:has(use[href^="/assets/file_icons/"])',
+	],
+};
+
+const FORGEJO_SELECTORS = {
+	row: [
+		'#repo-files-table .entry',
+		'#diff-file-tree .item-file',
+		'#diff-file-tree .item-directory',
+	],
+	filename: ['.name a.muted', 'span.gt-ellipsis'],
+	icon: ['.octicon-file-directory-fill', '.octicon-file'],
+};
+
+function mergeSelectors(key: keyof typeof GITHUB_SELECTORS): string {
+	return [
+		...GITHUB_SELECTORS[key],
+		...GITLAB_SELECTORS[key],
+		...FORGEJO_SELECTORS[key],
+	].join(',');
+}
+
 export const SELECTORS = {
-	row: `.js-navigation-container[role=grid] > .js-navigation-item,
-    file-tree .ActionList-content,
-    a.tree-browser-result,
-    .PRIVATE_TreeView-item-content,
-    .react-directory-filename-column,
-    [aria-label="Parent directory"]`,
-	filename: `div[role="rowheader"] > span,
-    .ActionList-item-label,
-    a.tree-browser-result > marked-text,
-    .PRIVATE_TreeView-item-content > .PRIVATE_TreeView-item-content-text,
-    .react-directory-filename-column .react-directory-filename-cell a,
-    [aria-label="Parent directory"] div`,
-	icon: `.octicon-file,
-    .octicon-file-directory-fill,
-    .octicon-file-directory-open-fill,
-    .octicon-file-submodule,
-    .react-directory-filename-column > svg,
-    [aria-label="Parent directory"] svg`,
+	row: mergeSelectors('row'),
+	filename: mergeSelectors('filename'),
+	icon: mergeSelectors('icon'),
 };
 
 export const icons = {
diff --git a/src/entries/content/index.ts b/src/entries/content/index.ts
index 57e63bb..216e651 100644
--- a/src/entries/content/index.ts
+++ b/src/entries/content/index.ts
@@ -7,7 +7,7 @@ import { flavor } from '@/storage';
 import { replaceIconInRow, injectStyles } from './lib';
 
 export default defineContentScript({
-	matches: ['*://github.com/*'],
+	matches: ['*://github.com/*', '*://gitlab.com/*', '*://codeberg.org/*'],
 	runAt: 'document_start',
 	main() {
 		// Replacing all icons synchronously prevents visual "blinks" but can
diff --git a/src/entries/content/lib.ts b/src/entries/content/lib.ts
index fa21443..2d31f8d 100644
--- a/src/entries/content/lib.ts
+++ b/src/entries/content/lib.ts
@@ -70,12 +70,18 @@ export async function replaceIconInRow(row: HTMLElement) {
 export async function replaceIcon(icon: HTMLElement, row: HTMLElement) {
 	const fileNameEl = row.querySelector(SELECTORS.filename) as HTMLElement;
 	if (!fileNameEl) return;
-	const fileName = fileNameEl.textContent?.split('/').at(0).trim();
+	const fileName = fileNameEl.textContent
+		?.split('/')
+		.at(0)
+		.trim()
+		/* Remove [Unicode LEFT-TO-RIGHT MARK](https://en.wikipedia.org/wiki/Left-to-right_mark) used on GitLab's merge request diff file tree. */
+		.replace(/\u200E/g, '');
 
 	const isDir =
 		icon.getAttribute('aria-label') === 'Directory' ||
 		icon.getAttribute('class')?.includes('octicon-file-directory-') ||
-		icon.classList.contains('icon-directory');
+		icon.classList.contains('icon-directory') ||
+		icon.classList.contains('folder-icon');
 	const isSubmodule =
 		icon.classList.contains('octicon-file-submodule') ||
 		fileNameEl
diff --git a/web-ext.config.ts b/web-ext.config.ts
index c8f0f99..07e7931 100644
--- a/web-ext.config.ts
+++ b/web-ext.config.ts
@@ -1,5 +1,9 @@
 import { defineRunnerConfig } from 'wxt';
 
 export default defineRunnerConfig({
-	startUrls: ['https://github.com/catppuccin/catppuccin'],
+	startUrls: [
+		'https://github.com/catppuccin/catppuccin',
+		'https://gitlab.com/gitlab-org/gitlab',
+		'https://codeberg.org/forgejo/forgejo',
+	],
 });