What is nira-browser copilot-instructions.md?

Project instructions for building and installing Nira Browser, a privacy-focused Android web browser. They describe its Kotlin code structure, build commands, device installation, and manual testing approach.

Use them when building debug APKs, cleaning builds, installing the app on an Android device, or changing tabs, profiles, groups, themes, storage, or browser screens.

They give contributors the commands and architectural boundaries needed to change the browser without overlooking its app layers or supported device builds.

How prirai/nira-browser configures GitHub Copilot

Reuse

Borrowing it

Nothing to install: this file belongs to prirai/nira-browser. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/prirai/nira-browser/main/.github/copilot-instructions.md

Clone the repo

git clone --depth 1 https://github.com/prirai/nira-browser

Made for: GitHub Copilot.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/prirai/nira-browser/copilot-instructions/github.svg)](https://agentmods.dev/instructions/prirai/nira-browser/copilot-instructions)

Your own site

<a href="https://agentmods.dev/instructions/prirai/nira-browser/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/prirai/nira-browser/copilot-instructions/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/prirai/nira-browser/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/prirai/nira-browser/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,503 This file is loaded in full into every session.

When invoked 2,503 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.02503	$0.02503
Opus 5.5	$0.01001	$0.01001
Sonnet 5.5	$0.00501	$0.00501
Haiku 4.5	$0.00250	$0.00250

Measured 10d ago against content hash fa876a96ef83, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

nira-browser copilot-instructions.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.github/copilot-instructions.md · 188 lines

How it starts

The opening of the file, as written. The whole thing — 188 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Copilot Instructions for Nira Browser

Nira Browser is a privacy-focused Android browser built on Mozilla's GeckoView engine, using Jetpack Compose, Material 3, MVVM architecture, and Kotlin Coroutines.

Build Commands

# Debug build (Windows)
gradlew.bat assembleDebug

# Clean build
gradlew.bat clean assembleDebug

# Install to connected device (ARM64)
adb install app/build/outputs/apk/debug/app-arm64-v8a-debug.apk

# Other APK variants (architecture-split builds)
# app-armeabi-v7a-debug.apk  (ARMv7)
# app-x86_64-debug.apk       (emulator)

No automated tests exist yet. Manual testing covers tabs, profiles, groups, and themes.

Architecture

Stack: MVVM · Jetpack Compose · GeckoView · Room + DataStore · Kotlin Coroutines/Flow · Manual DI

View (Composables)
  └─ observes StateFlow / calls functions
ViewModel (TabViewModel, etc.)
  └─ calls suspend functions
Manager (UnifiedTabGroupManager, ProfileManager, etc.)  ← acts as Repository
  └─ reads/writes
Database (Room) + DataStore

Critical files to understand before modifying

File	Role
`UnifiedTabGroupManager.kt`	Single source of truth for all tab group operations
`TabViewModel.kt`	Tab UI state — observes groups and tab lists
`TabOrderManager.kt`	Persists tab/group order via DataStore (JSON)
`ProfileManager.kt`	Profile lifecycle — create, delete, switch
`WebAppManager.kt`	PWA lifecycle — install, uninstall, profile binding
`Components.kt`	Manual DI container — initializes all managers
`ColorConstants.kt`	Color palette definitions and string→Int conversion
`BrowserFragment.kt`	Main browser screen entry point
`BrowserActivity.load()`	URL vs search. `engine == null` must not fall through to `toNormalizedUrl()`
`SearchEngineList.kt`	Nira default engines; `suggestUrl` must include `{searchTerms}`
`AwesomeBarWrapper.kt` / `NiraAwesomeBar.kt`	Address-bar suggestion UI; wrapper must invoke click/remove callbacks

Read the full file on GitHub · 188 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

10d ago First seen · 188 lines · 2,503 tokens per session scan A fa876a96ef83

Subscribe to this mod's changes

nira-browser copilot-instructions.md is an instructions file published in the GitHub repository prirai/nira-browser (212 stars, last pushed 15d ago), licensed MPL-2.0. It adds 2,503 tokens to every session, about $0.0100 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-27.

Kotlin and Swift Languages Mobile android android-browser android-browsers extensions firefox gecko

nira-browser copilot-instructions.md next to 6 instructions from other repositories
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nira-browser copilot-instructions.mdprirai/nira-browser	Instructions file	212	15d ago	MPL-2.0	A	2,503	GitHub Copilot
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vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
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nira-browser: Instructions file for GitHub Copilot