Keep getting bugged to update to Firefox Quantum but have updates turned off.

Only issue is I have lots of neat add ons that will not be supported and are tagged as legacy items that apparently are not supported in Quantum and there does not appear to be any replacements.

The most important one is this one for handling multiple tabs. It's great for saving pictures and web pages to local folders.

http://piro.sakura.ne.jp/xul/_multipletab.html.en

You hold the left mouse button down on a tab until it turns blue and drag across all the tabs you want to perform an action on.   Then it gives you the option to save, close or do other things with them.

It's a great tool for archiving posts and pictures I want to keep and I do not want to give it up as that means saving individual pics with right click , save as, on each one and the same for web pages.

Does anyone have something like this that is compatible with Firefox Quantum ?

Or is it possible to save multiple versions of Firefox as different profiles to avoid loosing these key add ons.

I know if the updates were turned on  Firefox would auto update and I would lose the ability to use this add on.

Windows 7 Firefox 56.0.2 64 bit version.

Any ideas.