Someone on this forum pointed out to me a
post by someone else on how to disable this global font emboldening.
There's a file called framework-res.apk located in /system/framework. If you rename the file to zip or rar or whatever and have something like winrar, you can access the files in the apk. There's a css file in the folder res/raw/ called webview_contrast_enchanced.css. You will find that font weights are set to 900. Take the CSS file out, replace all instances of 900 with 450, save and drag the file back int to replace the original. Restart and all will be good.
Things look much better now when you can tell the difference between regular and bold fonts.