This is a submission for the Gemma 4 Challenge: Build with Gemma 4
What I Built
I built PROOFER, a privacy first browser extension that helps me proofread text right where I am already typing, whether that is an email draft, a Discord message, a social post, or any other editable text field on the web.
Instead of copying text into a separate chatbot tab, PROOFER lets me select the text in place and trigger proofreading from a floating action button, a context menu entry, or a keyboard shortcut. The extension then sends only the selected text to the model, streams back the response, and shows a suggestion popup with a visual diff so I can quickly compare the original and the revised version.
The extension is built around a bring-your-own-model setup. Users configure their own endpoint in the popup, choose a model, and can connect PROOFER to LM Studio, Ollama, or any OpenAI-compatible API. This makes the tool flexible, but more importantly, it keeps the privacy model in the user's hands. If they run Gemma 4 locally, their writing never has to leave their machine.
