Select Settings from the Safari menu bar -> Content Blocking Rules. Disable the ad blockers that are in use.
If you have installed external ad blocking software, contact customer support of software manufacturer. The MT_Free Network does not support this software.
Click the Chrome Menu icon, open the Tools menu and click on Extensions from the sub-menu. Find the Adblock extension and disable it. Click the Refresh button.
Open up the Firefox browser >> Add-ons (in Mac OS X / Linux, click on Tools >> Add-ons), which will open the Firefox Add-ons Manager. Click Extensions; find the Adblock on the list of extensions and disable it.
Click the Yandex Menu icon, find the Adblock extension and disable it. Click the Refresh button.