I use ublock origin in Librewolf configured with Blocking mode: medium mode. As this mode blocks all 3rd party scripts and frames by default there’s a lot of login sites that don’t work because the use of captchas, so after some internet searching I’ve managed to make it work with following configuration in uBO my rules. You can replace * for a specific domain rule.
<span style="color:#323232;">* https://www.google.com/recaptcha/ script noop
</span><span style="color:#323232;">* https://www.google.com/recaptcha/ sub_frame noop
</span><span style="color:#323232;">* https://www.gstatic.com/recaptcha/ script noop
</span><span style="color:#323232;">* https://www.recaptcha.net/recaptcha/ script noop
</span><span style="color:#323232;">* https://www.recaptcha.net/recaptcha/ sub_frame noop
</span>
<span style="color:#323232;">* https://hcaptcha.com/1/api.js script noop
</span><span style="color:#323232;">* https://newassets.hcaptcha.com/c/ script noop
</span><span style="color:#323232;">* https://newassets.hcaptcha.com/captcha/ script noop
</span><span style="color:#323232;">* https://newassets.hcaptcha.com/captcha/ sub_frame noop
</span>
I’ve identified some sites that use other captchas
<span style="color:#323232;">www.dropbox.com dropboxcaptcha.com * noop
</span>
<span style="color:#323232;">login.aliexpress.com https://cf.aliyun.com/nocaptcha/ script noop
</span>
If you have other configs you can share here.