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

Implement shift+zoom behavior for the timeline, similar to the charts Open

polish

firefox-devtools/profiler#2398 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Write up a case study around Facebook Container Open

documentation

firefox-devtools/profiler#2405 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Make stack chart the first tab on the bottom panel on single tab(?) Open

active tab stack chart

firefox-devtools/profiler#2425 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Simplify chart panel toolbar on single tab Open

active tab

firefox-devtools/profiler#2426 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Show tracking protection is on or off in profile? Open

needs gecko patch

firefox-devtools/profiler#2432 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Allow users to write and save comments on a particular time window Open

firefox-devtools/profiler#2434 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Add test for track hiding when all tracks are hidden Open

active tab tests

firefox-devtools/profiler#2438 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Adapt or disable meta data popover for imported profiles Open

polish

firefox-devtools/profiler#2457 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Inconsistent application of multiple search terms Open

call tree markers polish

firefox-devtools/profiler#2464 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
This profile has weird unfinished requests Open

network panel

firefox-devtools/profiler#2479 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Move to wasm for the gzip/gunzip tool Open

perf profile data

firefox-devtools/profiler#2482 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Consider caching the profile view states during the view switch Open

code maintenance polish unified profiler

firefox-devtools/profiler#2485 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
VSync markers are present twice in the marker list Open

firefox-devtools/profiler#2502 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Profile sanitization does not constrain overhead counters to the range Open

privacy

firefox-devtools/profiler#2503 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Can't parse json while in private browsing mode. Open

firefox-devtools/profiler#2516 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Call tree width needs to take into account the size of items Open

call tree polish

firefox-devtools/profiler#2522 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Hidden screenshot tracks should be removed from the profile when sharing without hidden threads Open

polish privacy timeline

firefox-devtools/profiler#2528 · 3 comments · 1 reaction · 0 assignees · Indexed Sep 16, 2026
Improve data architecture for origins-based view, in support of Fission Open

fission profile data

firefox-devtools/profiler#2530 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Import for OpenTelemetry traces Open

firefox-devtools/profiler#2531 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Improve "Buffer Capacity" display, e.g. "8.00MB" -> "8 MiB" Open

firefox-devtools/profiler#2533 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 16, 2026
Can't upload profile due to "Out of Memory" error Open

firefox-devtools/profiler#2534 · 7 comments · 2 reactions · 0 assignees · Indexed Sep 16, 2026
Missing instructions on how to disable profiler completely Open

needs gecko patch polish

firefox-devtools/profiler#2540 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Marker Chart: Allow sorting, e.g., by first marker start time, etc. Open

markers

firefox-devtools/profiler#2541 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Consider combining the "isJS" and "relevantForJS" columns of the funcTable into a "stackType" column Open

firefox-devtools/profiler#2543 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
When re-symbolication splits funcs, discard any call tree transforms that refer to these funcs (avoid non-sensical state) Open

firefox-devtools/profiler#2544 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Switch to a profiler preset from a URL Open

needs gecko patch

firefox-devtools/profiler#2559 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Investigate the ways to eliminate the need of getTimelineHeight selector Open

code maintenance timeline

firefox-devtools/profiler#2561 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Warning in tests: "A worker process has failed to exit gracefully and has been force exited. This is likely caused by tests leaking due to improper teardown. Try running with --runInBand --detectOpenHandles to find leaks." Open

tests

firefox-devtools/profiler#2567 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Embedded data for share.firefox.dev links Open

firefox-devtools/profiler#2574 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Very slow response time when changing checkboxes when sharing performance profile Open

perf polish

firefox-devtools/profiler#2575 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
In Marker Table, "FileIO" marker descriptions don't show the marker name Open

markers polish

firefox-devtools/profiler#2582 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Chrome importer: "EventDispatch" markers should show event name Open

help wanted markers polish

firefox-devtools/profiler#2589 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
The new resources in the "active tab" view should be reachable and actionable with the keyboard Open

accessibility active tab timeline

firefox-devtools/profiler#2597 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Idea: Hide or mute idling threads Open

active tab

firefox-devtools/profiler#2599 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Resource tracks should have a tooltip for full URL Open

active tab polish

firefox-devtools/profiler#2600 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Removing profiler instrumentation stacks from native allocations and from js allocations Open

memory polish

firefox-devtools/profiler#2605 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Audit and fix our use of the "title" attribute in components Open

accessibility

firefox-devtools/profiler#2607 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Consider computing traced timing for diffed sample profiles Open

call tree

firefox-devtools/profiler#2615 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Measure arbitrary time in the marker chart Open

markers ready

firefox-devtools/profiler#2618 · 11 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Allow selecting a time range in the markers chart Open

markers

firefox-devtools/profiler#2620 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Sort markers hierarchically in the markers chart Open

markers

firefox-devtools/profiler#2622 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Display upload progress while importing profile from Firefox/"add-on" Open

polish ready

firefox-devtools/profiler#2624 · 23 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Feature: Show a combined bar for GC times in JavaScript only view Open

polish stack chart

firefox-devtools/profiler#2636 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
IndexedDB: The symbol-tables DB seems to exist but be empty sometimes Open

symbolication

firefox-devtools/profiler#2637 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Add a tooltip to see long marker names in the Marker Chart Open

markers polish

firefox-devtools/profiler#2638 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Consider removing the striped empty track area for active tab Open

active tab timeline

firefox-devtools/profiler#2644 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Deactivated tracks become activated again if profile sanitizing removes threads Open

polish

firefox-devtools/profiler#2645 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Consider displaying the errors thrown while storing profile data to IDB in the UI Open

polish unified profiler

firefox-devtools/profiler#2670 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Hard to spot GCs in Flamegraph due to noisy color palette Open

accessibility flame graph polish

firefox-devtools/profiler#2675 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 16, 2026
Create a shared component for Memory track derived tracks Open

code maintenance polish timeline

firefox-devtools/profiler#2680 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026

firefox-devtools/profiler

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