firefox-devtools/profiler

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Firefox Profiler — Web app for Firefox performance analysis

Stars: 1.5k
Forks: 491
Open beginner issues: 0
Indexed issues: 784
Avg merge: 3d 5h
Merged PRs (30d): 30

Dominant language: TypeScript
License: MPL-2.0
Last GitHub push: Sep 14, 2026
Latest indexed: Sep 16, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Open All

780 open issues indexed

Have a shared graph maximum value for all the event delay graphs Open

polish timeline

firefox-devtools/profiler#2681 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
src/test/fixtures/upgrades/processed-3.json doesn't seem to upgrade properly Open

profile data

firefox-devtools/profiler#2686 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Extension info isn't really stripped when requested from profiles Open

privacy profile data

firefox-devtools/profiler#2693 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Profiler import hangs with Conex (an extension) enabled Open

firefox-devtools/profiler#2694 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Handle clicking the activity graph for multiple selections of threads Open

polish timeline

firefox-devtools/profiler#2709 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Event delay calculations incorrect for threads with few events Open

firefox-devtools/profiler#2713 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Surprisingly long jank marker when the event delay track doesn't show anything unusual Open

markers

firefox-devtools/profiler#2720 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Create support for Marker Schema coming from Gecko Open

markers needs gecko patch

firefox-devtools/profiler#2732 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
[meta] Improve track hiding and context menus Open

meta polish timeline

firefox-devtools/profiler#2764 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
LogMarkers have a `name` property, they should have a `text` instead Open

markers polish

firefox-devtools/profiler#2782 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Merged threads look messy on stack chart if the threads are overlapping with each other Open

active tab polish stack chart timeline

firefox-devtools/profiler#2783 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Do not create a new Set for selectedThreadIndexes if we are selecting the same track Open

code maintenance perf polish timeline

firefox-devtools/profiler#2787 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Teach gecko profile processing to use the marker schema to properly offset timestamps Open

markers

firefox-devtools/profiler#2801 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Add a Testing Timeline, where testing markers can be added to the timeline Open

markers performance workflow timeline

firefox-devtools/profiler#2803 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Case study: toLocaleString Open

documentation

firefox-devtools/profiler#2807 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Case study: diagnosing a browser hang Open

documentation

firefox-devtools/profiler#2817 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Case study: Diagnostic a Firefox Freeze Open

documentation

firefox-devtools/profiler#2818 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 16, 2026
Fix the types of some of the ProfilerOverheadStats object fields Open

code maintenance help wanted ready

firefox-devtools/profiler#2856 · 23 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Using the main branch of the profiler should be easy Open

firefox-devtools/profiler#2860 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Write a script to simplify deployments and rollbacks Open

code maintenance

firefox-devtools/profiler#2862 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
[meta] Use absolute imports to import files from other directories Open

code maintenance meta

firefox-devtools/profiler#2865 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Add a mechanism to augment marker schema for special handling purposes Open

markers

firefox-devtools/profiler#2888 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Hook up "marker-table" and "marker-chart" filtering to the marker schema Open

markers

firefox-devtools/profiler#2889 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Screenshot: stop repeating the same screenshot over and over when it doesn't change Open

help wanted markers timeline

firefox-devtools/profiler#2949 · 15 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
"Collapse functions in" unexpectedly collapses different scripts on the same domain together Open

firefox-devtools/profiler#2955 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Misleading times displayed in the flame graph, should show number of samples instead Open

flame graph ready user-facing regression

firefox-devtools/profiler#2962 · 17 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
The selected row in the marker table should be included in the url Open

markers polish

firefox-devtools/profiler#2981 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Marker tooltip and sidebar should make it clear when a stack comes from another thread Open

assigned help wanted markers polish profile data ready

firefox-devtools/profiler#2986 · 10 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
The activity graph doesn't show a diff for the diffing track in the comparison view Open

comparison

firefox-devtools/profiler#2988 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Nested jank markers are confusing Open

markers user-facing regression

firefox-devtools/profiler#3002 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
GCMajor and other "nonexhaustive range" markers should be more clearly distinguished visually Open

markers polish

firefox-devtools/profiler#3011 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Add a histogram type to the marker schema Open

markers

firefox-devtools/profiler#3026 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Opening the publish panel for the first time is super slow Open

perf privacy

firefox-devtools/profiler#3032 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Double-clicking a "clipped" marker in the marker chart sets an inconsistent range selection Open

timeline

firefox-devtools/profiler#3034 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Selecting multiple threads hides IPC markers in the marker chart Open

markers

firefox-devtools/profiler#3038 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
<DebugWarning> is incorrect because it doesn't differentiate between optimized builds with/without release optimizations Open

needs gecko patch

firefox-devtools/profiler#3040 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Allow to compare two profiles for their memory usage Open

polish

firefox-devtools/profiler#3061 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Fix types, or remove higher order components Open

code maintenance

firefox-devtools/profiler#3062 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Add a hamburger overflow menu to the top right side of profile viewer Open

timeline

firefox-devtools/profiler#3068 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Marker issue with sanitization Open

markers

firefox-devtools/profiler#3070 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Showing marker tooltips (and generally interacting with the profiler UI) is very slow Open

markers perf timeline

firefox-devtools/profiler#3072 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Profile markers displayed incorrectly in compare view Open

markers user-facing regression

firefox-devtools/profiler#3109 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Cannot read a json file produced by hawktracer Open

help wanted profile data

firefox-devtools/profiler#3112 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Consider keeping the deploy preview URLs when publishing & shortening Open

polish

firefox-devtools/profiler#3121 · 6 comments · 1 reaction · 0 assignees · Indexed Sep 16, 2026
Clean up the fallback label code for FileIO markers Open

code maintenance help wanted markers needs gecko patch

firefox-devtools/profiler#3131 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
The "Profiled Duration:" unit is incorrect Open

help wanted polish profile data

firefox-devtools/profiler#3138 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Upload can sometimes be very slow or fail Open

polish

firefox-devtools/profiler#3139 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
New layout for the marker chart: Display stack-based markers in a stack-chart-like layout Open

firefox-devtools/profiler#3141 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Screenshots are dropped, if you untick "Include hidden threads" when uploading Open

markers privacy

firefox-devtools/profiler#3148 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Profiler UI doesn't let me remove the last samples track (to leave only a screenshot track) Open

markers privacy

firefox-devtools/profiler#3149 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026

firefox-devtools/profiler

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