Requesting support for firefox

[adrianvanburen]

Is your feature request related to a problem? Please describe.

I just tested this script on my wordpress site ( https://www.lyka.stream/ ) and it works only in chrome; would it be possible to support firefox since it seems to support prefetching? See: https://caniuse.com/link-rel-prefetch

Additional context
Firefox:

Chrome:

As you see, chrome works ideally, but firefox does not work

I am using Firefox version 101

[pereorga]

This may be related to a Firefox bug: links not being prefeched in Firefox in some circumstances: https://bugzilla.mozilla.org/show_bug.cgi?id=1783225

[kronthto]

We can also notice this behaviour: The link tags get added to the Head by the JS of this lib, but no requests are happening.
I've found a few resources claiming that Firefox only respects rel="prefetch" tags that were there when the document was loaded, not dynamically injected:

• https://stackoverflow.com/questions/30996119/link-rel-prefetch-in-firefox-network-panel
• Firefox does not support <link rel='prefetch'> inserted after DOMContentLoaded angular/angular#8908
• https://bugzilla.mozilla.org/show_bug.cgi?id=580313 (closed with some patches that I'm not sure address the problem)

As a workaround, if the user-agent indicates Firefox, the XHR method could be used instead?

[adrianvanburen]

@kronthto I later got to the bottom of it, I learned while Firefox supports prefetch, this behaviour is disabled by default. You have to go into the advanced settings to activate it, then this script begins to work. Unfortunately this means we have no workaround for delivering it to all Firefox users yet.

gijo-varghese/flying-pages#14 (comment)