selenium-screenshot-compare
Compare a website's rendering between two Firefox versions through a click-based navigation scenario. At each step, both full-page renders are captured and their pixel difference is measured.
Usable from plain Python or as a Robot Framework library.
Installation
uv add selenium-screenshot-compare
# or pip install selenium-screenshot-compare
You need two Firefox binaries (your system Firefox + a second version). See docs/firefox-setup.md for how to get one.
Quick start — Python
from selenium_screenshot_compare import DualSession, compare_images
session = DualSession("/usr/bin/firefox", "./firefoxes/firefox-128esr/firefox")
session.open("https://example.com")
session.click("css=a.nav-link")
session.capture_both("a.png", "b.png")
result = compare_images("a.png", "b.png", "diff.png")
print(f"{result.percent:.2f} % difference")
session.close()
Quick start — Robot Framework
uv add selenium-screenshot-compare[robot]
# or: pip install selenium-screenshot-compare[robot]
robot --outputdir output/robot tests/interactive_navigation.robot
Open Versions ${SITE} ${FIREFOX_A} ${FIREFOX_B}
Capture And Compare home ${CAPTURES_DIR}
Click Element css=a[href="/photographie"]
Capture And Compare after-click ${CAPTURES_DIR}
[Teardown] Close Versions
Keywords
| Keyword | Role |
|---|---|
Open Versions |
open the URL in both Firefox instances |
Go To |
navigate to a URL |
Click Element |
click (css=, id=, xpath=…) |
Input Text |
type text |
Go Back |
previous page |
Capture And Compare |
capture + diff + result.json |
Load Storage State |
inject cookies + localStorage (authenticated session) |
Close Versions |
close both browsers |
Output
Each Capture And Compare produces a folder with version_a.png,
version_b.png, diff.png, and a result.json:
{
"difference_percent": 0.0,
"first_diff_y": null,
"firefox_a": "152.0.1",
"firefox_b": "128.0"
}
Documentation
- How the comparison works — pixel-diff algorithm, threshold, outputs
- Why Firefox? — full-page screenshots, portable binaries, ESR baseline
- Keyword reference — detailed docs for every Robot Framework keyword
- Firefox setup — getting a second Firefox binary (Linux / Windows / macOS)
- Authenticated sessions — comparing pages behind a login
- Windows notes — Firefox paths, running suites
- Contributing — development setup, linting, CI, releasing
License
1 maintainer
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