Why watch ads in the first place? Install uBlock Origin.

I'll try this but websites seems to know that an ad blocker is in operation and stops the site loading unless I disable the ad blocker or agree to pay for ad free access.

Many thanks TyDraniu - yes, that seems to have done the trick. Firefox now back to loading everything at "normal" speed again. And no more ads for ladies underwear (which I don't have much use for).

Mark

Ad blockers are great, and I highly recommend using uBlock Origin as TyDraiu suggests.

But to go a step further and achieve the goal of only one tab being loaded when restoring a session, I configure my Firefox as follows. It really cuts down on the resources used and lets you control which tabs to load.

Navigate to about:config and change the following settings.

Unpinned tabs are restored unloaded by default, just ensure this did not get changed to false. browser.sessionstore.restore_on_demand set to true (default is true)

Pinned tabs are restored loaded by default, so change this setting to make them consistent with the unpinned tab restoration behavior. browser.sessionstore.restore_pinned_tabs_on_demand set to true (default is false)

Optional: Personally, I like to be able to have an easier way to tell that a tab is loaded/uloaded, so I also set this as well. browser.tabs.fadeOutUnloadedTabs set to true (default is false)