Developer builds TGDown Chrome extension for one-click Telegram Web media downloads

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A developer has released TGDown, a Manifest V3 Chrome extension built with TypeScript and Vue that adds download controls for images and videos directly within Telegram Web. The extension supports both Telegram Web interfaces and offers one-click downloads, batch downloads from search results, and a popup panel listing detected media. TGDown operates across three execution contexts — a content script, a page-context script, and extension pages — to stay isolated from Telegram's internal code while using its existing authenticated session. During development, a critical dark-mode bug caused the entire Telegram page to flash white due to a full-screen iframe rendering the browser's default white canvas before initializing. The developer resolved the issue by replacing the iframe approach with a Shadow DOM host, which maintains CSS isolation without introducing a separate document rendering surface.

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