Nabil

Do you know why your posts are not getting any comments? It’s probably because of the website input field in the comment form.
My personal experience: the number of comments increased dramatically after I removed that website field.
In addition to removing the website field from the comments form, the plugin removes these fields from the profile page:
<ul>
<li>Personal Options section (Visual Editor, Admin Color Scheme, Keyboard Shortcuts, Toolbar & Admin Language)</li>
<li>About Yourself section (Biographical Info)</li>
</ul>
Once installed, all the fields & sections mentioned above will no longer be available to users.

Remove Fields

Remove the website field from the comment form and also remove some other rarely used profile fields

Petermann

Add a class in the form field.
Example of use with <a href="https://wordpress.org/plugins/contact-form-7/" rel="ugc">Contact Form 7</a>:
<pre><code>[tel your-phone class:phone placeholder "Phone"]
</code></pre>
Listing of classes available for use.
<pre><code>('span.start, input.start').mff_mask('00/0000');
('span.date, input.date').mff_mask('00/00/0000');
('span.time, input.time').mff_mask('00:00:00');
('span.time2, input.time2').mff_mask('00:00');
('input.date_time').mff_mask('00/00/0000 00:00:00');
('input.date_time2').mff_mask('00/00/0000 00:00');
('input.cep').mff_mask('00000-000', { clearIfNotMatch: true });
('input.zip').mff_mask('00000');
('input.phone, input[name="phonebr"]').mff_mask(PhoneMaskBehavior, nonoOptions);
('input.phone_us').mff_mask('(000) 000-0000');
('input.taxid').mff_mask('00-0000000');
('input.ssn').mff_mask('000-00-0000');
('input.mixed').mff_mask('AAA 000-S0S');
('input.cpf').mff_mask('000.000.000-00', { reverse: true, clearIfNotMatch: true });
('input.cnpj').mff_mask('00.000.000/0000-00', { reverse: true, clearIfNotMatch: true });
('input.money').mff_mask('000.000.000.000.000,00', { reverse: true });
('input.money2').mff_mask('#.##0,00', { reverse: true });
('input.money3').mff_mask('#,##0.00', { reverse: true });
('input.money4').mff_mask('000,000,000,000,000.00', { reverse: true });
('input.money5').mff_mask('#.##0', { reverse: true });
('input.money6').mff_mask('#,##0', { reverse: true });
('input.ip_address').mff_mask('099.099.099.099');
('input.percent').mff_mask('##0,00%', { reverse: true });
('input.percent2').mff_mask('##0.00%', { reverse: true });
('input.percent3').mff_mask('990,0%', { reverse: true });
('input.percent4').mff_mask('990.0%', { reverse: true });
('input.percent5').mff_mask('#,##0%', { reverse: true });
('input.percent6').mff_mask('#.##0%', { reverse: true });
</code></pre>
<a href="https://gist.github.com/petermann/fd1a898e02ca91a0d7231a9f8ee662b4" rel="nofollow ugc">Click here</a> for more details on how to add custom mask.
Optional 
– Added option for the format of the Brazilian phone number, with attribute <code>name</code> equal to <code>phonebr</code>.
<h3>Credits</h3>
<a href="https://github.com/igorescobar/jQuery-Mask-Plugin" rel="nofollow ugc">jQuery Mask Plugin</a>

Masks Form Fields

A plugin to add masks in the form’s fields.

Remove Fields vs Masks Form Fields