extensionworkshop.com

Ranks Overall #1,413 Built Awesome #958

Data from Oct 3, 2026, 5:52 PM UTC 4d old Measured once a week · 7 runs since Aug 20, 2026

Elsewhere: PageSpeed Insights · Calibre · Treo · CrUX Vis · Tame the Bots · Scoring Calculator · Wayback Machine

Lab data is measured using Lighthouse, Mobile mode unless otherwise specified. Field data is reported from Chrome UX Report (using p75 measurements).

Stack

Op Hosted by Self-hosted

Lighthouse Scores LAB Simulated

Performance

no change

Accessibility

no change

100

Best Practices

no change

SEO

no change

Metrics LAB FIELD

Core Web Vitals: passing 3 of 3 assessed from real Chrome users.

Field figures are the p75 across real Chrome users over a 28-day trailing window (2026-09-04 → 2026-10-01), url-level.

Metric	Lab Simulated	Field
LCP CWV Largest Contentful Paint	4.75 s poor	↑ +27 ms (+0.6%) 2.03 s – 7.12 s	2.23 s good	82.8% 14.6% 2.6%
INP CWV Interaction to Next Paint — field only, no lab run can measure it	n/a	—	159 ms good	83.9% 8.5% 7.6%
CLS CWV Cumulative Layout Shift	0.002 good	→ no change 0.002 – 0.002	0.010 good	96.3% 1.9% 1.8%
TBT Total Blocking Time	116 ms good	→ no change 78 ms – 116 ms	n/a	—
FCP First Contentful Paint	1.35 s good	↓ -1 ms (-0.1%) 1.29 s – 1.52 s	1.36 s good	88.5% 8.2% 3.3%
Speed Index	1.86 s good	↑ +48 ms (+2.6%) 1.81 s – 2.63 s	n/a	—
TTFB Time to First Byte	746 ms good	↓ -1 ms (-0.1%) 692 ms – 917 ms	756 ms good	78.3% 18.5% 3.2%

Metric

Lab Simulated

Field

Value

Change / range

Trend

p75

Distribution

LCP CWV Largest Contentful Paint

4.75 s poor

↑ +27 ms (+0.6%) 2.03 s – 7.12 s

2.23 s good

82.8% 14.6% 2.6%

INP CWV Interaction to Next Paint — field only, no lab run can measure it

n/a

—

159 ms good

83.9% 8.5% 7.6%

CLS CWV Cumulative Layout Shift

0.002 good

→ no change 0.002 – 0.002

0.010 good

96.3% 1.9% 1.8%

TBT Total Blocking Time

116 ms good

→ no change 78 ms – 116 ms

n/a

—

FCP First Contentful Paint

1.35 s good

↓ -1 ms (-0.1%) 1.29 s – 1.52 s

1.36 s good

88.5% 8.2% 3.3%

Speed Index

1.86 s good

↑ +48 ms (+2.6%) 1.81 s – 2.63 s

n/a

—

TTFB Time to First Byte

746 ms good

↓ -1 ms (-0.1%) 692 ms – 917 ms

756 ms good

78.3% 18.5% 3.2%

LCP Subparts LAB Unthrottled

The subparts attribute LCP to your server, resource discovery, download, or rendering. Note that the Lab LCP shown above is a simulated throttled estimate.

resource load duration 237 ms

resource load delay 90 ms

element render delay 47 ms

time to first byte 46 ms

LCP LAB Simulated vs LCP FIELD

Lab 4.75 s

Field p75 2.23 s

The lab LCP is 2.13× the field p75 — real users likely have above-average hardware or network connectivity.

Page weight

Metric	Value	Change / range
Page Weight	782 kB	↑ +1.8 kB (+0.2%) 777 kB – 782 kB
Requests	41	→ no change 41 – 41
Third-party Weight	189 kB	↑ +2.3 kB (+1.3%) 184 kB – 189 kB
Third-party CPU	54 ms	↑ +2 ms (+3%) 49 ms – 58 ms
Unused JS	105 kB	↑ +593 B (+0.6%) 102 kB – 105 kB
Unused CSS	33.7 kB	↓ -21 B (-0.1%) 33.7 kB – 33.7 kB

Metric

Value

Change / range

Trend

Page Weight

782 kB

↑ +1.8 kB (+0.2%) 777 kB – 782 kB

Requests

→ no change 41 – 41

Third-party Weight

189 kB

↑ +2.3 kB (+1.3%) 184 kB – 189 kB

Third-party CPU

54 ms

↑ +2 ms (+3%) 49 ms – 58 ms

Unused JS

105 kB

↑ +593 B (+0.6%) 102 kB – 105 kB

Unused CSS

33.7 kB

↓ -21 B (-0.1%) 33.7 kB – 33.7 kB

By resource type

Type	Share	Size	Requests
script	33.6%	263 kB	5
font	31.7%	248 kB	3
image	23.5%	184 kB	29
stylesheet	4.9%	38.5 kB	1
document	3.6%	28.1 kB	1
other	2.6%	20.0 kB	2
Total		782 kB	41

Third parties 3 entities

Entity	Transfer	Size	Main thread Simulated
Google Tag Manager	script	163 kB	51 ms
Mozilla		15.6 kB	0 ms
YouTube		10.4 kB	3 ms
Total		189 kB	54 ms

Entity

Transfer

Size

Main thread Simulated

Google Tag Manager

script

163 kB

51 ms

Mozilla

15.6 kB

0 ms

YouTube

10.4 kB

3 ms

Total

189 kB

54 ms

Page health

Metric	Value	Change / range
Main Thread Work	1.18 s	↓ -82 ms (-6.5%) significant 1.14 s – 1.26 s
Long Tasks	5	→ no change 3 – 5
DOM Elements	1,412	→ no change 1,412 – 1,412
Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports)	9	→ no change 6 – 9
A11y Failures	3	→ no change 3 – 3
A11y Failing Nodes	8	→ no change 8 – 8

Metric

Value

Change / range

Trend

Main Thread Work

1.18 s

↓ -82 ms (-6.5%) significant 1.14 s – 1.26 s

Long Tasks

→ no change 3 – 5

DOM Elements

1,412

→ no change 1,412 – 1,412

Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports)

→ no change 6 – 9

A11y Failures

→ no change 3 – 3

A11y Failing Nodes

→ no change 8 – 8

Main thread work

Task	Share	Duration Simulated
script evaluation	34%	406 ms
other	31%	369 ms
style layout	18%	207 ms
paint composite render	6%	71 ms
script parse compile	6%	66 ms
parse HTML	4%	53 ms
garbage collection	1%	9 ms
Total		1.18 s

Task

Time

Duration Simulated

script evaluation

34%

406 ms

other

31%

369 ms

style layout

18%

207 ms

paint composite render

71 ms

script parse compile

66 ms

parse HTML

53 ms

garbage collection

9 ms

Total

1.18 s

Axe violations axe-core 4.13.0, full rule set

9 violating nodes across 4 rules, 878 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.

moderate heading-order — Heading levels should only increase by one 4 nodes
Offending elements
1. .medium-12 > .block-link > h4
```
<h4>Brand new to extensions development?</h4>
```
2. .tile-compact.medium-6.tile-block-link:nth-child(1) > .block-link > h4
```
<h4>Community Forums</h4>
```
3. #slick-slide10 > .block-link > h4
```
<h4>Nova is here: what changes for your Firefox theme</h4>
```
4. .large-3.small-12.cell > h4
```
<h4>Twitter</h4>
```

minor aria-allowed-role — ARIA role should be appropriate for the element 2 nodes

Offending elements

#slick-slide00

<a href="https://developer.mo..." class="cell small-12 large-..." rel="noreferrer noopener" target="_blank" data-slick-index="0" aria-hidden="false" tabindex="0" role="tabpanel" id="slick-slide00" ar…

#slick-slide10

<a href="https://blog.mozilla..." class="cell small-12 large-..." data-slick-index="0" aria-hidden="false" tabindex="0" role="tabpanel" id="slick-slide10" aria-describedby="slick-slide-control1..." s…

serious link-name — Links must have discernible text 2 nodes

Offending elements

#slick-slide00

<a href="https://developer.mo..." class="cell small-12 large-..." rel="noreferrer noopener" target="_blank" data-slick-index="0" aria-hidden="false" tabindex="0" role="tabpanel" id="slick-slide00" ar…

#slick-slide10

<a href="https://blog.mozilla..." class="cell small-12 large-..." data-slick-index="0" aria-hidden="false" tabindex="0" role="tabpanel" id="slick-slide10" aria-describedby="slick-slide-control1..." s…

moderate landmark-unique — Landmarks should have a unique role or role/label/title (i.e. accessible name) combination 1 node
Offending element
1. .mzp-c-footer-primary
```
<nav class="grid-container grid-x grid-padding-x mzp-c-footer-primary">
```

Accessibility failures 3 of 34 audits

heading-order — Heading elements are not in a sequentially-descending order 4 nodes
link-name — Links do not have a discernible name 2 nodes
target-size — Touch targets do not have sufficient size or spacing. 2 nodes

SEO failures 1 of 10 audits

link-text — Links do not have descriptive text 3 items

Hygiene

HTTPS HSTS CSP Clickjacking protection Origin isolation Trusted Types bfcache h2

Measurement log

Field history 25 weeks

Weekly p75 from the CrUX History API, backfilled in a single request.

Week ending	LCP	INP	CLS	FCP	TTFB
2026-09-26	2.20 s	167 ms	0.010	1.41 s	759 ms
2026-09-19	2.14 s	182 ms	0.010	1.38 s	759 ms
2026-09-12	2.17 s	167 ms	0.010	1.44 s	791 ms
2026-09-05	2.07 s	171 ms	0.010	1.40 s	755 ms
2026-08-29	1.97 s	160 ms	0.010	1.38 s	791 ms
2026-08-22	1.95 s	168 ms	0.010	1.42 s	770 ms
2026-08-15	1.95 s	174 ms	0.010	1.43 s	820 ms
2026-08-08	1.95 s	146 ms	0.010	1.43 s	809 ms
2026-08-01	2.08 s	157 ms	0.010	1.43 s	802 ms
2026-07-25	2.08 s	157 ms	0.010	1.40 s	790 ms
2026-07-18	2.08 s	144 ms	0.010	1.32 s	760 ms
2026-07-11	2.14 s	144 ms	0.010	1.37 s	821 ms

Week ending

LCP

INP

CLS

FCP

TTFB

2026-09-26

2.20 s

167 ms

0.010

1.41 s

759 ms

2026-09-19

2.14 s

182 ms

0.010

1.38 s

759 ms

2026-09-12

2.17 s

167 ms

0.010

1.44 s

791 ms

2026-09-05

2.07 s

171 ms

0.010

1.40 s

755 ms

2026-08-29

1.97 s

160 ms

0.010

1.38 s

791 ms

2026-08-22

1.95 s

168 ms

0.010

1.42 s

770 ms

2026-08-15

1.95 s

174 ms

0.010

1.43 s

820 ms

2026-08-08

1.95 s

146 ms

0.010

1.43 s

809 ms

2026-08-01

2.08 s

157 ms

0.010

1.43 s

802 ms

2026-07-25

2.08 s

157 ms

0.010

1.40 s

790 ms

2026-07-18

2.08 s

144 ms

0.010

1.32 s

760 ms

2026-07-11

2.14 s

144 ms

0.010

1.37 s

821 ms

Runs

Every stored run for this URL, newest first.

When	Perf	LCP	CLS	TBT	Weight	Runs	Spread	Bench	Took	Archive
Oct 3, 2026, 5:52 PM UTC	82	4.75 s	0.002	116 ms	782 kB	3/3	±8	2,470 -1%	27.7s	Wayback
Sep 26, 2026, 2:14 PM UTC	82	4.72 s	0.002	116 ms	780 kB	3/3	±25	2,487 0%	30.6s	Wayback
Sep 19, 2026, 12:58 PM UTC	98	2.03 s	0.002	112 ms	780 kB	3/3	±31	2,335 -6%	30.4s	Wayback
Sep 12, 2026, 11:34 AM UTC	81	4.89 s	0.002	78 ms	779 kB	3/3	±2	2,669 +7%	28s	Wayback
Sep 5, 2026, 8:10 AM UTC	78	5.77 s	0.002	99 ms	779 kB	3/3	±15	2,491 0%	28.7s	Wayback
Aug 29, 2026, 5:52 AM UTC	75	7.12 s	0.002	83 ms	778 kB	3/3	±11	2,298 -8%	30.3s	Wayback
Aug 20, 2026, 10:30 PM UTC	82	4.75 s	0.002	107 ms	777 kB	3/3	±22	2,349 -6%	29.8s	Wayback

When

Scores

Perf

LCP

CLS

TBT

Weight

Runs

Spread

Bench

Took

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Stack

Lighthouse Scores LAB 🤖 Simulated

Metrics LAB FIELD

LCP Subparts LAB 🐇 Unthrottled

LCP LAB 🤖 Simulated vs LCP FIELD

Page weight

By resource type

Third parties 3 entities

Page health

Main thread work

Axe violations axe-core 4.13.0, full rule set

Accessibility failures 3 of 34 audits

SEO failures 1 of 10 audits

Hygiene

Measurement log

Field history 25 weeks

Runs

Embed this score

Lighthouse Scores LAB Simulated

LCP Subparts LAB Unthrottled

LCP LAB Simulated vs LCP FIELD