firefox-devtools/profiler

View on GitHub

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

Format numbers and dates depending on the language determined by fluent Open

i18n polish

firefox-devtools/profiler#3414 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Draw markers that have the same name with the same color Open

firefox-devtools/profiler#3442 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
from-url with http://localhost URLs does not work in Safari Open

firefox-devtools/profiler#3446 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Ctrl+click doesn't show the Profiler Specific Contextual Menu on macOS Open

call tree

firefox-devtools/profiler#3453 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Add a correct "Recording start time"(?) to Profile Info Open

polish

firefox-devtools/profiler#3458 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Profile page crash during profiling a firefox bug Open

firefox-devtools/profiler#3467 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Implement a better UX for markers where the frequency/period is more important than their exact location Open

markers

firefox-devtools/profiler#3474 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Unable to jump to external script source. Open

firefox-devtools/profiler#3475 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
The file size should not (only) be displayed in the Download button, to reduce the temptation for misclicks Open

polish privacy

firefox-devtools/profiler#3478 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Repeated invocations of processThreadCPUDelta during symbolication take up more time than necessary Open

help wanted perf profile data

firefox-devtools/profiler#3481 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Should link to "Reporting a performance problem" docs Open

firefox-devtools/profiler#3495 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
The testing methed "triggerResponse" in the mock WebChannel should probably be asynchronous Open

tests

firefox-devtools/profiler#3503 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Supporting importing Event Tracing for Windows traces (ETW, .etl, .etlx?) Open

profile data

firefox-devtools/profiler#3512 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Incorrect selected range after sharing a profile without hidden threads. Open

privacy

firefox-devtools/profiler#3518 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Consider having Compare View warn the user about very different versions (i.e. possibly uncomparable) Open

comparison polish

firefox-devtools/profiler#3521 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
"Upload profile" has hanged and failed to upload several times recently Open

firefox-devtools/profiler#3523 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Incorrect range on this profile captured with the nostacksampling feature Open

firefox-devtools/profiler#3538 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Provide a way to bookmark states inside the app Open

firefox-devtools/profiler#3543 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
The content process of a page load may be hidden if the page uses very little JavaScript Open

firefox-devtools/profiler#3552 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Flame Graph segment width seems to be weighted by sample count rather than time Open

memory

firefox-devtools/profiler#3558 · 8 comments · 1 reaction · 0 assignees · Indexed Sep 16, 2026
Show the starting time of a marker in the marker tooltip Open

markers polish

firefox-devtools/profiler#3559 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Persist the current range preselection to the URL Open

polish timeline

firefox-devtools/profiler#3571 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Consider adding a settings panel / popover for timeline Open

timeline

firefox-devtools/profiler#3578 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
When importing perf profiles with headers, import the profile capture time into the profile Open

firefox-devtools/profiler#3581 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Clicking in a blank part of the activity graph re-selects the selected node Open

firefox-devtools/profiler#3587 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Consider adding a "Show all tracks of this process" option Open

firefox-devtools/profiler#3597 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Negative duration in "Waiting for socket thread" on fenix Open

network panel

firefox-devtools/profiler#3600 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Consider exposing the total number of network requests on the network tab Open

firefox-devtools/profiler#3616 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Memory track could show heat map for number of (de)allocation calls Open

memory timeline

firefox-devtools/profiler#3617 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Handle correctly profiles that contain data from private browsing Open

privacy profile data

firefox-devtools/profiler#3624 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Loading profiles from a file in a non-Firefox browser is delayed by five seconds Open

firefox-devtools/profiler#3638 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Use the marker schema to decide if we should show the markers in the timeline Open

markers polish timeline

firefox-devtools/profiler#3659 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
ActivityGraph Tooltip should show the sample's page Open

help wanted timeline

firefox-devtools/profiler#3664 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
ActivityGraph tooltip doesn't support window.persistTooltips Open

help wanted timeline

firefox-devtools/profiler#3665 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Markers with negative durations have no tooltip Open

firefox-devtools/profiler#3669 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
The behavior of transforms with merged threads coud be improved Open

data transform

firefox-devtools/profiler#3681 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Consider adding a row to the end of the timeline that says "+ N more hidden tracks" to make hidden tracks more explicit Open

polish timeline

firefox-devtools/profiler#3687 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
The algorithm to control the ellipsis in our canvas-based panels can be improved Open

flame graph markers polish stack chart

firefox-devtools/profiler#3691 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Show the CPU time of the preview selection close to the selection's range Open

polish timeline

firefox-devtools/profiler#3693 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
The tooltip saying "either buffer full or profiler not started yet" could be clarified Open

polish timeline

firefox-devtools/profiler#3694 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Make it easier to do a selection from 2 markers Open

markers

firefox-devtools/profiler#3696 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Handle selected markers in the marker chart Open

markers

firefox-devtools/profiler#3697 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
All memory graphs should have the same scale Open

memory polish

firefox-devtools/profiler#3698 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
We should be able to right click on the sample graph Open

polish timeline

firefox-devtools/profiler#3699 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Show timestamps in activity graph tooltips Open

polish timeline

firefox-devtools/profiler#3701 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
In the profile upload panel, only show the Screenshots checkbox for profiles with screenshots Open

firefox-devtools/profiler#3704 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 16, 2026
In the profile upload panel, only show the "extension information" checkbox for profiles with extension information Open

firefox-devtools/profiler#3705 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 16, 2026
"Path" sanitization does not strip paths for native code Open

firefox-devtools/profiler#3706 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Hide category information in profiles without categories Open

firefox-devtools/profiler#3708 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Add "dynamic" category colors Open

firefox-devtools/profiler#3711 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026

firefox-devtools/profiler

Get new issues in your inbox