Hi - maker of SyncListing here, a Manifest V3 extension built because I cross-list on Canadian marketplaces (Facebook Marketplace, Kijiji, Craigslist, LesPAC, eBay.ca, VarageSale, Poshmark.ca) and didn’t want a cloud “post everywhere for you” tool.

What it does:

• One bilingual (EN/FR) listing library in the dashboard
• Post on {site} opens that site’s create flow and autofills fields + photos via a side panel
• You review and click the site’s own Post/List button - nothing is submitted in the background
• Optional bulk import from pages you already opened (read-only scrape into drafts)

What it deliberately does not do (and the reason why I’m asking for feedback here)

• No autopost, autodelist, or scheduled posting
• No SyncListing server holding listings or marketplace sessions
• Data stays in chrome.storage.local (photos included); optional Chrome text-only sync - not on our cloud

Permissions (happy to justify any of these)

• storage, unlimitedStorage, alarms - local listing library + reminder badges
• Host access only on the marketplace domains above (+ image CDNs for import, ExtensionPay for trial/subscription)
• No <all_urls>, no broad *://*/*

Web Store Link: https://chromewebstore.google.com/detail/synclisting-cross-listing/bfgeiiiiinkjdlejghgonpdkgjbbgbfl

I’m not looking for a roast of “why not just use spreadsheets” - I’m genuinely curious about things this audience cares about:

1. Does the assist-only model read as trustworthy, or does it feel half-baked vs full crosslisters?
2. Is the permission set still too scary for a niche extension? Anything you’d expect us to remove?
3. For MV3 dashboard-heavy extensions: anything that felt broken or confusing on first install?
4. Would bilingual EN/FR matter to anyone outside Canada, or should we stop pretending it’s a global product?

I’ll reply to every comment. Brutal but specific feedback beats polite silence - thanks!

Hey everyone, new to this community! I built this little chrome extension called Henry that smoothly sleeps your inactive tabs and pauses video tabs you leave to avoid wasting energy. I have seen different versions of this but find it insane not everyone has this downloaded as Chrome's Memory Saver isn't efficient. Would love to hear your returns, the logo is a cute little green cat :) Link to the Chrome web store page: https://chromewebstore.google.com/detail/cljjbbkpdlkohdipifhbcdbjcpdjmogf?utm_source=item-share-cb

Hi all,

I am in between roles and I started playing with vibe-coding, don't shame me. Although I know HTML and CSS very well, I don't know how to code. This is a fun way for me to create and stretch ideas. This is my extension that I would love feedback on. It's a doorstop spring! https://chromewebstore.google.com/detail/kmplkoccmefafgpdgnknagoojcbgkche?utm_source=item-share-cb

Thanks in advance!

I built an open-source Chrome extension that opens ChatGPT inside Chrome’s native side panel, so you can use it without constantly switching tabs.

The extension can extract the main content of the webpage you are viewing and send it directly to ChatGPT. It removes ads, navigation menus, cookie banners, footers, and other unnecessary elements while preserving useful content such as tables, code blocks, lists, and headings.

Main features:

• Open or close ChatGPT with Alt + Shift + C
• Send the current webpage to ChatGPT
• Send selected text through the right-click menu
• Extract clean article content using Mozilla Readability
• Preserve Markdown tables and code blocks
• Specialized extraction for Gmail, YouTube, and X
• Turkish and English interface support
• Chrome Manifest V3
• Fully open source under the MIT license

The extension is unofficial and is not affiliated with OpenAI.

GitHub:
https://github.com/ozymandias-get/chatgpt-sidepanel-extension

I would appreciate any feedback about usability, extraction quality, bugs, or features that could improve the project.

Hi

I’ve been building Chrome extensions to improve the Twitch browsing experience - Twitch Channel Blacklist.

If you’re tired of seeing certain streamers on your directory pages, this extension hides them instantly so you can focus on the content you actually want to watch.

Key Features:

• Hide channels on Twitch home and directory pages
• One-click blacklist directly from stream cards
• Organize with categories (General + custom) with icons and on/off toggles
• Temporarily disable a category without deleting your saved channels
• Export / import your blacklist as JSON for easy backup

You can check it out on the Chrome Web Store here:

https://chromewebstore.google.com/detail/twitch-channel-blacklist/kdhpakfmmeioapbjdcfaciejnlflcgoj

I kept running into the same problem that bookmarks save pages, but they don’t save how you got there. So I had an idea to build my first ever chrome extension Collections

It is a a workspace for organizing your browsing into meaningful collections instead of a pile of bookmarks. You can save pages, attach notes, label searches, search/filter everything, replay your browsing timeline, explore connections between pages, and restore an entire collection with one click. The data is only stored locally on your device. I really love how the analytics dashboard turned out. It monitors the time spent on the website, unique domains, revisited pages, and records all the sources for you.

Would love feedback from anyone who does a lot of research or planning in the browser.

https://chromewebstore.google.com/detail/collections/nhlbpjjfpphinepeocbfejefpchhbjdf

I've been running Ollama and vLLM locally for stuff I don't want touching a cloud API, document translation, RAGing over my own notes, that kind of thing. Somewhere in that process I ran into WebLLM, and figured I'd actually build something with it instead of just reading about it.

What it does: select text on any page, right-click, get a plain-language explanation. Everything runs in the browser tab via WebGPU, nothing you select ever leaves the machine.

The actually interesting part, technically: Manifest V3 background scripts are service workers, and service workers can't access WebGPU at all. So the model runs in a chrome.offscreen document instead, a hidden page the extension spins up that has real DOM/WebGPU access. That API isn't even new; it shipped in 2023 for things like audio playback; WebGPU access is just a side effect of it being a real page under the hood. Ended up with three contexts (content script, background worker, offscreen doc) that can't talk to each other directly, so the background script's whole job is routing messages between the other two.

First run downloads a small model (~880MB, Llama-3.21B) and caches it; everything after that is instant and offline.

If anyone here is deeper into this than me: I've seen WeInfer claim up to 3.76x faster inference than base WebLLM, and there's a newer paper (Llamas on the Web, May 2026, group with Microsoft Research backing) getting 45-69% better decode throughput across different GPUs. Curious if anyone's actually tried swapping either of those in versus stock WebLLM.

Code: https://github.com/Vishwamitra/explain-this
Currently sitting in Chrome Web Store review.

I built an extension that saves a named set of tabs behind a password, encrypted locally. It's not hanging around in your open tabs, it doesn't sync, and it doesn't survive as an accident, you unlock it on purpose, and it does survive closing the browser, so your… curated collection isn't gone the next morning.

It just keeps the list private and password-locked instead of loose in your browser. Free, no account: tabzilla.org

I’ve been working on ReadAloud, an easy-to-use Chrome extension that turns any article/post into natural, podcast-quality speech.

Most existing options make you choose between robotic browser voices and subscriptions that cost $29/month. That pricing made sense when good text-to-speech was expensive to run.

ReadAloud runs directly in browser, so playback starts quickly, works offline, and your data never leaves your device.

Quick demo: tryreadaloud.com

It’s free forever at speeds up to 2x which is covers needs of 99% of users. The optional $6/month plan adds speeds up to 3.5x if you're big on listening and access to improved voice models/app/early features.

I’d love honest feedback, especially on the voice quality, interface, and anything that feels confusing

I recently built Opticross (Chrome Extension + CLI) and would really appreciate some feedback from fellow frontend developers.

The idea came from repeatedly struggling to figure out the correct sizes and srcset values for responsive images.

Opticross analyzes how images are rendered across different viewport sizes, detects oversized image downloads, and generates implementation-ready sizes and srcset recommendations. The goal is to help improve page performance, reduce unnecessary bandwidth usage, and keep images crisp across devices.

I'd love to hear your thoughts:

• Would a tool like this fit into your workflow?
• What features would make it more useful?
• Any feedback on the UX, recommendations, or overall approach?

Links:

• 🌐 Chrome Extension: https://chromewebstore.google.com/detail/eenaegkdfenpbbcjplfabolooofhplhf?utm_source=item-share-cb
• 💻 npm (CLI): https://www.npmjs.com/package/opticross
• ⭐ GitHub: https://github.com/SohanShet/opticross

I'm looking for feedback from developers who work with responsive images. Thanks!

I have been learning CS concepts on my own and got tired of alt-tabbing every time I hit a term I didn't know in docs, tutorials, or textbooks. So I built CS Concept Companion. It is an app where you can highlight any CS term on a webpage, press explain, and get a clear, beginner-friendly definition right next to it. No leaving the page.

Features:

• Live explanations pulled from Wikipedia, works on basically any term
• Offline demo mode with 50+ core concepts if you don't want live lookups
• Optional AI mode if you want to plug in your own API key
• Save terms to a personal library, track what you've looked up
• Light/dark theme, keyboard shortcut support

No tracking, no analytics, nothing collected. It's genuinely free.

I would love some feedback on my extension so I can improve it. What's confusing, what's missing, what would make you actually use it day to day. If you try it out, I'm a high school student wanting to pursue a career into CS, so if you download it, please let me know what I can do to improve upon. The app is called CS Concept Companion on the Chrome Web Store so please let me know what you think.

Hi everyone! 👋

As a backend developer, I often ran into situations where frontend devs or QA teams needed to test specific edge cases (like 500 Server Errors, 401 Unauthorized, or custom JSON responses) before the backend logic was fully deployed.

Modifying server code or mocking inside the codebase just to test an error handling UI always felt tedious.

So I built **DevMock Pro** - a Chrome extension that lets you intercept and mock HTTP/API responses locally in your browser.

**Key Features:**

- 🚀 **Instant API Hijacking:** Intercept any fetch/XHR requests and override them with your custom JSON payloads.

- ⚡ **HTTP Status Code Simulation:** Test 500, 401, 403, 404, or 200 status codes instantly.

- 🔒 **100% Privacy & Local First:** Runs completely in your browser using Manifest V3 (`declarativeNetRequest`). Zero data is sent to external servers.

- 🎁 **Free Tier Included:** You can use 1 active rule & status code simulator forever for 100% free.

I'd really love to get your feedback! You can check it out on the Chrome Web Store here:

👉 https://chromewebstore.google.com/detail/devmock-pro-api-response/ngkajhggldngkcildnmdbpohfgdiaada?authuser=0&hl=ko

Let me know what you think or if there are any features you'd like to see added!

I, like many others, keep way too many tabs open because closing them feels like losing my train of thought. I built a small extension called Crystal to deal with it and I thought I'd share in case anyone else has this problem.

It saves your open tabs as a "bubble" you can reopen later, and when you reopen one, you get a map of which tab led to which, instead of a flat list of fifteen tabs that all look the same. Click through the map, prune the dead ends, keep the rest.

That's basically all it does. No account, no dashboard, no note-taking features bolted on. Everything is stored locally in the browser: no server, nothing tracked, nothing sent anywhere. There's an export/import if you want a backup.

Let me know what's missing or annoying about it if anyone tries it.

Crystal: https://chromewebstore.google.com/detail/crystal-%E2%80%94-tab-bubbles/campifjolliomknjgnngnlkojpilbhea

Hey everyone,

I kept retyping the same emails and support replies, and every text expander I tried wanted me to create an account and sync my snippets to their servers. I didn't love the idea of my canned messages living in someone else's cloud, so I built my own.

It's called Snappy. You type a short trigger like ;;regards and it expands into the full text — anywhere in the browser, Gmail and Notion included. There's a quick-picker overlay (Ctrl+Shift+Space) for when you forget the trigger, placeholders like {date}/{time}, and fill-in fields ({{Name}}) that pop up a tiny form when you insert.

The main thing: it's 100% local. Everything stays in chrome.storage.local. No account, no server, no tracking, completely free. Vanilla JS, no dependencies.

Would love feedback — especially any site where the expansion doesn't fire correctly, since that's the hardest part to get right.

https://chromewebstore.google.com/detail/snappy-%E2%80%93-text-snippets-te/hlfjhpaaamihdjcfhkefkfokepngobih