mod_pagespeed .htaccess configuration

mod_pagespeed .htaccess

<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType image/jpg "access 1 year"
ExpiresByType image/jpeg "access 1 year"
ExpiresByType image/gif "access 1 year"
ExpiresByType image/png "access 1 year"
ExpiresByType text/css "access 1 month"
ExpiresByType text/html "access 1 month"
ExpiresByType application/pdf "access 1 month"
ExpiresByType text/x-javascript "access 1 month"
ExpiresByType application/x-shockwave-flash "access 1 month"
ExpiresByType image/x-icon "access 1 year"
ExpiresDefault "access 1 month"
</IfModule>

RewriteEngine On

#Begin gzip and deflate
<IfModule mod_deflate.c>
    AddOutputFilterByType DEFLATE text/html text/css application/x-javascript text/plain text/xml image/x-icon
</IfModule>

<IfModule pagespeed_module>
  ModPagespeed on
  ModPagespeedEnableFilters rewrite_css,combine_css
  ModPagespeedEnableFilters recompress_images
  ModPagespeedEnableFilters convert_png_to_jpeg,convert_jpeg_to_webp
  ModPagespeedEnableFilters collapse_whitespace,remove_comments
</IfModule>

So if I have pagespeed.conf in mods-available in the apache folder, how then should I configure what is given here? Because all the pagespeed related settings are done in that file, right? Want to try to set this up for wordpress, so want to make sure I get it right.

It would be interesting to update someone, does it really not let the images load in Firefox?

(necro)
All major browsers now support webp, so the firefox info is no longer true. Only caveat is macs prior to Big Sur operating system running safari.
(source) https://caniuse.com/?search=webp