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

Abbreviate method names to show most relevant info based on available space Open

firefox-devtools/profiler#5194 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Marker that have no duration should be open ended on the unfinished side Open

markers

firefox-devtools/profiler#5208 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Add the ability to annotate some certain areas of the profile Open

ux-needed

firefox-devtools/profiler#5211 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
UI could look better in High Contrast Mode Open

accessibility

firefox-devtools/profiler#5218 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Use `postMessage` to open external links from sandboxed iframe Open

firefox-devtools/profiler#5223 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
VS Code extension for Firefox Profiler Open

firefox-devtools/profiler#5224 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Clarify Data Storage in user documentation Open

documentation privacy

firefox-devtools/profiler#5235 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Call Tree filter input clear button isn't accessible Open

accessibility

firefox-devtools/profiler#5236 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
When bitly refuses to shorten the URL because it is too long, show an explanation Open

firefox-devtools/profiler#5240 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Change "This buffer was empty." tooltip text to "No samples in this range." Open

firefox-devtools/profiler#5253 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Automatic thread selection picks a bad thread in this profile (selected thread has no samples) Open

firefox-devtools/profiler#5255 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
An error occurred in Firefox Profiler Open

firefox-devtools/profiler#5258 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Error: Expected the distance to be less than the array length Open

firefox-devtools/profiler#5271 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
FR: Documentation of timeline feature Open

documentation

firefox-devtools/profiler#5278 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
An error occurred in Firefox Profiler while analysing a profile Open

help wanted profile data timeline

firefox-devtools/profiler#5290 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Long track names should not hide the pid or selected tick in the track selector Open

polish timeline

firefox-devtools/profiler#5296 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Store the profile time range in the profile, rather than computing it based on samples / markers Open

profile data timeline

firefox-devtools/profiler#5300 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
In the marker schema, add the ability to mark fields as privacy-sensitive Open

markers profile data

firefox-devtools/profiler#5301 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Require all marker fields to be listed in the schema Open

markers meta

firefox-devtools/profiler#5302 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Make CompositorScreenshot markers schema-based Open

markers

firefox-devtools/profiler#5303 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Make Network markers schema-based Open

markers network panel

firefox-devtools/profiler#5304 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Make various GC markers schema-based Open

markers memory

firefox-devtools/profiler#5305 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Declare IPC marker fields in the schema Open

markers profile data

firefox-devtools/profiler#5306 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Write an upgrader to add hidden schema fields to all remaining schemas with undeclared fields Open

markers

firefox-devtools/profiler#5307 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Change the Chrome importer to emit schema-based markers Open

profile data

firefox-devtools/profiler#5308 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Consider changing "Running" to "Total" in the sidebar, because "running size" / "running bytes" sounds strange Open

sidebar

firefox-devtools/profiler#5311 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
In the marker schema, support label templates with conditional behavior depending on whether a field is present Open

markers profile data

firefox-devtools/profiler#5314 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Make the idle frames more obvious with a distinct border color on Sample tooltip stacks Open

polish timeline

firefox-devtools/profiler#5316 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Make `SampleTooltipContents` localizable Open

i18n timeline

firefox-devtools/profiler#5321 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Couldn’t retrieve the profile from ⁨Firefox (WebExtension Tabs) Open

firefox-devtools/profiler#5339 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
A taxonomy of call tree transforms Open

firefox-devtools/profiler#5340 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Add network track support to the Chrome importer Open

markers

firefox-devtools/profiler#5343 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Add a tooltip to the memory dropdown ("data source" / "call tree summary strategy") Open

call tree help wanted

firefox-devtools/profiler#5352 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Add an optional plot in the memory track for "physical memory" Open

memory timeline

firefox-devtools/profiler#5365 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Allow selecting stacks by clicking between samples in the sample graph (should select closest sample) Open

timeline

firefox-devtools/profiler#5372 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Back/forward broken after using tab selector Open

timeline

firefox-devtools/profiler#5381 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Avoid having variables with "Milliseconds" or "time" in their name containing byte values Open

code maintenance

firefox-devtools/profiler#5382 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Annotate profiles when slowdowns with known causes are detected Open

firefox-devtools/profiler#5383 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
hiddenLocalTracksByPid in the URL is too long for profiles with lots of processes Open

firefox-devtools/profiler#5391 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Wrong flow-id strings in markers when multi-selecting threads Open

firefox-devtools/profiler#5402 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Slow dispatch() during symbolication - 8 seconds of 100% CPU usage checking selectors Open

firefox-devtools/profiler#5403 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Mobile View Fix: scrolling is broken in different areas Open

firefox-devtools/profiler#5419 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
scrolling across the whole main view, profileViewerWrapper, is broken Open

firefox-devtools/profiler#5420 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
scrolling across the layout-panes is broken - both the top and bottom Open

firefox-devtools/profiler#5421 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
scrolling up and down the lower pane is broken Open

firefox-devtools/profiler#5422 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 16, 2026
Mobile View Fix: Cannot resize the panels Open

firefox-devtools/profiler#5423 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Mobile View Fix: header links and views from those links are broken Open

firefox-devtools/profiler#5424 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Consider always displaying the marker name in the marker chart Open

markers polish

firefox-devtools/profiler#5437 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 16, 2026
Change how the processed format stores which pages correspond to a thread / process (stop relying on innerWindowID in the frameTable) Open

firefox-devtools/profiler#5442 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026
Remove innerWindowID from the frameTable once the active tab view is gone Open

firefox-devtools/profiler#5443 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 16, 2026

firefox-devtools/profiler

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