Source evidence

FireFox?

Speculative Loading · support · 2025-03-06T22:21:00+00:00

Speculative Loading plugin evidence original source source API

complaintsentiment

mediumseverity

0.8relevance

2replies

Evidence linked to opportunitycommercial context

Proof Health

Open evidence

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Conversation

support

Josh Journey unresolved

According to this listing description: Other browsers such as Safari and Firefox will ignore the functionality with no ill effects; they will simply not benefit from the speculative loading. Why is FireFox not supported? According to Mozilla it seems supported: https://developer.mozilla.org/en-US/docs/Web/Performance/Guides/Speculative_loading And has been well supported in recent times: https://caniuse.com/?search=prefetch Warm regards, Josh Firefox supports the older <link rel="prefetch"> resource hint, but not the newer Speculation Rules API. The new API includes many benefits over <link rel="prefetch"> including: Full prerender as well as prefetch Automatic link finding Different eagerness levels Better DevTools support More consistent behaviour (particular with cross-origin prefetching/prerendering). It is no longer recommended to use <link rel=prefetch> for navigation prefetches, and instead to use the new Speculation Rules API for this, and to only use <link rel=prefetch> for subresources. However, we have asked Firefox’s position on this new API and they are positive on it , so hopefully that means support will come to Firefox at some point, at which point this plugin should support it. @tunetheweb Thank you so much for the detailed explanation, evaluation and creating a Github post! I’m very pleased to hear there is interest from Mozilla to support the newer Speculation Rules API. I’m a huge fan of FireFox so this will be a lovely treat. 🙂 Warm regards, Josh

Commercial Context

Opportunity

performance monitoring and client reporting

Performance speed regression monitoring for keeping sites fast and proving optimization work

Buyer: site owners, agencies, and maintenance teams

Wedge: detect performance slowdowns, cache conflicts, asset regressions, and client-report impact

Proof Blocked card complete market

Analysis

heuristic-v1

Summary: FireFox?: users show performance, support pain that may indicate a product gap.

Evidence quote: Why is FireFox not supported?

Affected feature: form

performance support support value

Plugin

API

Speculative Loading

70.0K active installs · 430.8K downloads · rating 100.0

javascript performance prefetch prerender speculation rules

Comments

2 shown

tunetheweb 2025-03-06T22:27:00+00:00

Firefox supports the older <link rel="prefetch"> resource hint, but not the newer Speculation Rules API. The new API includes many benefits over <link rel="prefetch"> including: Full prerender as well as prefetch Automatic link finding Different eagerness levels Better DevTools support More consistent behaviour (particular with cross-origin prefetching/prerendering). It is no longer recommended to use <link rel=prefetch> for navigation prefetches, and instead to use the new Speculation Rules API for this, and to only use <link rel=prefetch> for subresources. However, we have asked Firefox’s position on this new API and they are positive on it , so hopefully that means support will come to Firefox at some point, at which point this plugin should support it.

Josh Journey 2025-03-07T17:20:00+00:00

@tunetheweb Thank you so much for the detailed explanation, evaluation and creating a Github post! I’m very pleased to hear there is interest from Mozilla to support the newer Speculation Rules API. I’m a huge fan of FireFox so this will be a lovely treat. 🙂 Warm regards, Josh