How to fix mixed content warnings for plugin resources?

For this you will need to use a plugin like Better Search Replace to replace http://yoursite with https://yoursite

WordPress saves URLs in the database absolutely. So if you at one point in time had the site with http and then changed to use https WordPress would still have the http urls saved in the database.

WordPress doesn’t automatically update its database when a site switches to https to fix urls.

Better Search Replace , once installed will let you do a dry run to test out the replacement to see if it will work without accidentally messing up your database. Once you are satisfied with the results, run the replacement for real and that should do the trick.

Of course using a search and replace plugin is only one of many ways to alter the database, but it’s one I find fast and effective.

NOTE: Back up your website first.!!!