darken-page-except-video-player
The dark mode the site never shipped, on the one page you watch.
Live tools
Live
tools:
the
agent
writes
a
tool
for
one
site,
and
you
keep
it
When no built-in tool does the job, the agent writes one in JavaScript for that page. You read the code before it runs, and a tool you keep runs by name, without the agent.
Steps
How a live tool is made
-
01
Ask for what no tool does
Turn on the Live tool switch and describe the job: seek a video, read a canvas, archive every row.
-
02
Read the code
The panel shows the full source, never truncated, and you approve that source before it runs.
-
03
Keep it
A second after it works, the panel asks whether to keep it. Name it, or take the name it suggests.
-
04
Run it by name
Type / on that site and pick it. It runs without the agent and without asking you again.
The name
How a live tool is named
The name has three parts: the site, the kind of page, and a name you choose. Only the last part is yours.
/youtube.com:watch:darken-page-except-video-player
The site
Where it was made, and the only place it runs.
The kind of page
The first part of the path. Every watch page, not one video.
What you called it
Yours to name. This is the part you type.
Scope
Where a live tool is offered
On pages of the same kind, on the same host. A tool made on a YouTube watch page is offered on every watch page and nowhere else.
-
youtube.com/watch?v=anythingoffered -
youtube.com/watch/liveoffered -
youtube.com/resultsnot here -
youtube.comnot here -
music.youtube.com/watchnot here
Examples
Small fixes for pages you use often
Each is a few lines the agent writes once.
collapse-bot-comments
Fold every automated comment on a pull request so the human ones are left.
archive-newsletters
Clear the promotions out of an inbox in one press instead of forty.
copy-table-as-csv
Take the table a dashboard will not export and put it on the clipboard.
Security
Where a live tool is stored, and what can call it
The code stays in the browser
The extension stores it. Browsentic Bridge learns that a tool exists and what it does, never its code.
Nothing runs unread
You read the source before its first run. Keeping the tool is what lets later runs skip the prompt.
MCP clients cannot reach it
It is not a page tool, so nothing an MCP client can call touches it. Only the side panel can run it.
Removing one
Type /remove-tools for the list, with a cross beside each. Removing a tool deletes its code.
Give your browser a superpower.
Free and open source under Apache 2.0, with no API key, subscription or account. One line installs Browsentic Bridge and opens the extension’s store page. Nothing connects until you pair the two.
Available in the Chrome Web Store
Available on Edge Add-ons
Firefox add-on, signed by Mozilla