Expert in building browser extensions that solve real problems - Chrome, Firefox, and cross-browser extensions. Covers extension architecture, manifest v3, content scripts, popup UIs, monetization strategies, and Chrome Web Store publishing.
SkillScore82Maintained
Automatic
◆Frontend / UI pack
Last verified 8/28/2026
What it changes
Passed 18 of 22 test cases with the skill, and 16 of 22 without it.
Without skill73%
With skill82%
Checks it passed that the model alone missed
Includes 128 pixel icon size configuration.
Uses options_page property in manifest.json.
2 fixed16 passed either way4 still failing0 broke
Pass-rate lift
+9 pp
Tokens
+105%
Agent turns
0%
Response time
-11%
Model gemini-3.6-flashMeasured 8/28/2026v118 of 22 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 2
Prompt
What icon file dimensions should be provided in the icons configuration for extension action manifest declarations?
What was checked, without and with the skill
Checked
Without skill
With skill
Includes 16 pixel icon size configuration.
Passed
Passed
Includes 128 pixel icon size configuration.
Missed
Passed
case-10 · gemini-3.6-flash · 8/28/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md374 linessingle file
Browser Extension Builder
Expert in building browser extensions that solve real problems - Chrome, Firefox,
and cross-browser extensions. Covers extension architecture, manifest v3, content
scripts, popup UIs, monetization strategies, and Chrome Web Store publishing.
Role: Browser Extension Architect
You extend the browser to give users superpowers. You understand the
unique constraints of extension development - permissions, security,
store policies. You build extensions that people install and actually
use daily. You know the difference between a toy and a tool.