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

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780 open issues indexed

An error occurred in Firefox Profiler Open

firefox-devtools/profiler#4914 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Cannot open Chrome Trace Event profile Open

firefox-devtools/profiler#4915 · 1 comment · 2 reactions · 0 assignees · Indexed Sep 16, 2026
Allow filtering network markers by content type in the network marker chart Open

firefox-devtools/profiler#4916 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Python 3.12 perf import Open

firefox-devtools/profiler#4918 · 3 comments · 2 reactions · 0 assignees · Indexed Sep 16, 2026
No way to read long marker label names on marker chart Open

firefox-devtools/profiler#4934 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 16, 2026
Consider putting CORS-accessible JS in the source view Open

firefox-devtools/profiler#4940 · 0 comments · 3 reactions · 0 assignees · Indexed Sep 16, 2026
It's not easy to get the names of functions that has namespaces / class names that are taking a lot of character space (e.g. due to generic parameters) Open

call tree flame graph polish stack chart

firefox-devtools/profiler#4944 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Provide prebuilt release for airgapped networks Open

firefox-devtools/profiler#4946 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
无法读取或解析其中的分析记录。 Open

firefox-devtools/profiler#4947 · 14 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Make it easy to find the line that calls a function Open

source view

firefox-devtools/profiler#4948 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
respect prefers-color-scheme Open

firefox-devtools/profiler#4954 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 16, 2026
Feature: Ability to select multiple rows in the marker table and copy their contents Open

firefox-devtools/profiler#4972 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Feature: Focusing and excluding by modules Open

flame graph

firefox-devtools/profiler#4979 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Avoid the need for `perf script` when importing from perf Open

firefox-devtools/profiler#4980 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Feature: Auto-classification/labeling of threads based on rules & shared library of thread func (general purpose profiler) Open

firefox-devtools/profiler#4986 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
A 24MB profile is slow to analyse and takes 2.4GB RAM to open Open

perf

firefox-devtools/profiler#4989 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Remove the active tab filtering from the activity graph Open

active tab

firefox-devtools/profiler#4995 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Order global tracks by the CPU score Open

active tab

firefox-devtools/profiler#4996 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Make the cpu score visible in the track selection list Open

active tab timeline

firefox-devtools/profiler#4998 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Consider adding the ability to shrink some tracks Open

active tab

firefox-devtools/profiler#4999 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Make innerWindowID columns optional Open

firefox-devtools/profiler#5006 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Diff view makes it hard to find slower functions because faster and slower functions are mixed Open

firefox-devtools/profiler#5010 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Support the "stack-chart" option for a marker display location Open

JS Execution Tracing

firefox-devtools/profiler#5018 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Markers drawn in the stack chart are not very visible when they're small Open

JS Execution Tracing

firefox-devtools/profiler#5019 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Do we rely on the order of markers anywhere? Open

firefox-devtools/profiler#5021 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
We should support string indexes for all marker string types Open

firefox-devtools/profiler#5022 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
High memory usage for profiles with lots of tracks Open

firefox-devtools/profiler#5024 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
The marker field-based search should match field labels as well Open

markers polish

firefox-devtools/profiler#5029 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Make the profiler UI more usable on mobile devices Open

mobile

firefox-devtools/profiler#5049 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Export network requests as HAR Open

firefox-devtools/profiler#5051 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
An error occurred in Firefox Profiler Open

firefox-devtools/profiler#5060 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
An error occurred in Firefox Profiler: TypeError: can't access dead object. Open

firefox-devtools/profiler#5066 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Add a way to do logical AND/OR in search filters Open

ux-needed

firefox-devtools/profiler#5069 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Make the ZipFileViewer.js file localizable Open

help wanted i18n polish

firefox-devtools/profiler#5080 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
When a marker search doesn't return any data, we could search other threads to know if it's present elsewhere and give a hint Open

firefox-devtools/profiler#5083 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Make it possible to show patterns instead of colors for categories Open

accessibility

firefox-devtools/profiler#5085 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Extract networking logs from profile to Logan (log analyzer) Open

firefox-devtools/profiler#5088 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Support new network-related markers to break up the phase "waiting for socket thread" in network markers Open

markers network panel

firefox-devtools/profiler#5092 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
captured profile doesnt load Open

firefox-devtools/profiler#5095 · 13 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Make the stack chart display traces sequentially instead of by actual time. Open

JS Execution Tracing

firefox-devtools/profiler#5097 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Consider opening source files in debugger as well Open

discussion JS Execution Tracing

firefox-devtools/profiler#5114 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Consider showing the recorder JS tracer values in the profiler UI Open

discussion JS Execution Tracing

firefox-devtools/profiler#5115 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
500ms of jank when showing the marker chart for this thread Open

markers perf

firefox-devtools/profiler#5120 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Option for custom marker ordering Open

firefox-devtools/profiler#5152 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
On a profile with memory tracking captured, multiple UI/UX bugs on selecting a timerange (blank tooltip, disappearing marker on graph, slow selection) Open

memory timeline

firefox-devtools/profiler#5165 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Cannot compare two JS allocation profiles Open

firefox-devtools/profiler#5168 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Long marker values should wrap in the marker table sidebar Open

firefox-devtools/profiler#5171 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Add UI for flows Open

firefox-devtools/profiler#5178 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Page chooser button should remain highlighted while the dropdown is open Open

firefox-devtools/profiler#5184 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Allow removing "Upload Local Profile" option from the top bar Open

firefox-devtools/profiler#5193 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026

firefox-devtools/profiler

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