sitespeedio/browsertime

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Measure and Optimize Web Performance

Stars: 652
Forks: 141
Open beginner issues: 0
Indexed issues: 33
Avg merge: 3h 56m
Merged PRs (30d): 5

Dominant language: JavaScript
License: Apache-2.0
Last GitHub push: Sep 14, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Beginner friendly Everything

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33 open issues indexed

LastVisualChange reports late values caused by invisible browser re-rasterization noise Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

sitespeedio/browsertime#2529 · Opened Jul 19, 2026
Native support for external ad/tracker blocklists (URLs/Files) to measure third-party impact Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

sitespeedio/browsertime#2364 · Opened Mar 10, 2026
Fix url.parse() DeprecationWarning for NodeJS 24 Open

sitespeedio/browsertime#2336 · 1 assignee · Opened Nov 10, 2025
Firefox PerfStats feature mask needs to be updated to support 64bit mask Open

bug

Difficulty 1/5 Under an hour Newbie friendliness 48/100

sitespeedio/browsertime#2313 · 9 comments · Opened Jul 17, 2025
Chrome 135 edge to edge on Android Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

sitespeedio/browsertime#2265 · Opened Mar 4, 2025
Create better error messages for broken scripts Open

sitespeedio/browsertime#2248 · 1 assignee · Opened Jan 9, 2025
Visual metrics pick up too early First Visual change sometimes on Samsung A51 Open

android Visual Metrics

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sitespeedio/browsertime#2224 · 8 comments · Opened Dec 18, 2024
Netlog stopped working for Firefox on Linux Open

firefox

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sitespeedio/browsertime#2202 · 6 comments · Opened Nov 9, 2024
Wrong LCP element reported in metrics section Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sitespeedio/browsertime#2198 · Opened Nov 4, 2024
Firefox on Moto G5 have 0 visual metrics for https://www.wikipedia.org Open

android firefox

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sitespeedio/browsertime#2178 · 2 comments · Opened Sep 11, 2024
Proper typescript types Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

sitespeedio/browsertime#2169 · Opened Aug 20, 2024
firefox.collectMozLog does not work on Android Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sitespeedio/browsertime#2127 · 2 comments · Opened May 15, 2024
Firefox on Android always runs power usage tests Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

sitespeedio/browsertime#2073 · 2 comments · Opened Feb 1, 2024
Add types to https://github.com/DefinitelyTyped/DefinitelyTyped Open

enhancement help wanted

Difficulty 4/5 3-5 days Newbie friendliness 25/100

sitespeedio/browsertime#2063 · 2 comments · Opened Jan 8, 2024
Implement support for soft navigations in Chrome(ium) Open

enhancement upstream

Difficulty 5/5 Over a week Newbie friendliness 35/100

sitespeedio/browsertime#2000 · 8 comments · Opened Oct 17, 2023
Does browsertime support DoT or DoH? Open

awaiting response

Difficulty 4/5 3-5 days Newbie friendliness 25/100

sitespeedio/browsertime#1985 · 1 comment · Opened Sep 2, 2023
StopWatch and custom metrics associated with wrong URL-or-alias Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sitespeedio/browsertime#1983 · 3 comments · Opened Aug 18, 2023
Add GitHub action test for --debug Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

sitespeedio/browsertime#1962 · 1 comment · Opened Jun 20, 2023
Make sure LCP from Chrome and visual elements use the same element. Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 42/100

sitespeedio/browsertime#1910 · Opened Mar 8, 2023
Windows Firefox videos become corrupted when I use `--videoParams.convert false --videoParams.addTimer false` Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

sitespeedio/browsertime#1903 · 2 comments · Opened Feb 15, 2023
Await for the gecko profiler start instead of adding a synthetic delay Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

sitespeedio/browsertime#1857 · 2 comments · Opened Oct 17, 2022
Browsertime can't connect to Webdriver if the first ip bound to loopback interface is not 127.0.0.1 Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 38/100

sitespeedio/browsertime#1820 · Opened Jul 23, 2022
No Har file when using Safari on MacOS Monterrey Open

safari upstream

Difficulty 3/5 1-2 days Newbie friendliness 48/100

sitespeedio/browsertime#1777 · 4 comments · Opened Apr 28, 2022
browsertime visual metrics don't work with wayland Open

enhancement help wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

sitespeedio/browsertime#1756 · 7 comments · Opened Apr 5, 2022
Geckoprofiler visualProgress timestamp is null Open

firefox

Difficulty 3/5 1-2 days Newbie friendliness 35/100

sitespeedio/browsertime#1746 · 7 comments · Opened Mar 31, 2022
Collect screenshots for visual elements Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

sitespeedio/browsertime#1637 · Opened Sep 15, 2021
Expose Firefox and Chrome runtime settings Open

chrome edge enhancement firefox

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sitespeedio/browsertime#1622 · Opened Aug 12, 2021
Running with --video where the video would need to be overwritten silently stalls browsertime (macOS) Open

sitespeedio/browsertime#1566 · 5 comments · 1 assignee · Opened Apr 30, 2021
Make it possible to get tcpdump from rooted Android phones Open

android enhancement

Difficulty 5/5 Over a week Newbie friendliness 15/100

sitespeedio/browsertime#1523 · Opened Mar 26, 2021
Inconsistent replacing of characters in path names Open

bug help wanted

sitespeedio/browsertime#1487 · 3 comments · 1 assignee · Opened Feb 9, 2021
Do not add use metrics if the main page gives an HTTP error Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

sitespeedio/browsertime#1337 · Opened Aug 18, 2020
Setting ViewPort and UserAgent chops off part of the video and filmstrips Open

bug

sitespeedio/browsertime#1222 · 16 comments · 1 assignee · Opened Mar 19, 2020
Screenshot differs between Selenium and the video Open

bug chrome

Difficulty 4/5 3-5 days Newbie friendliness 25/100

sitespeedio/browsertime#953 · 1 comment · 1 reaction · Opened Oct 3, 2019

sitespeedio/browsertime

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