Firefox dies on opening main workspace (many tabs)

[QuAzI]

Firefox dies. PC frozen. Only reset helps.

I have more than 500 tabs (to read later, to do later and some other to prevent lost interesting links). Most of them sleeps (because added in previous sessions and not opened today). I need tool to organize tabs. Today I install this addon.
When I create new workspace 21 last tabs moved into new workspace without any reasons. I switched to new workspace and all moved tabs loaded (!), when only last (current) tab must be loaded (like in default Firefox behaviour for session restore). But Firefox works. Now when I try to switch into main workspace ALL 500+ tabs try to load again. Even If I don't wont to use it today. And Firefox dies on loading 500+ tabs in one moment. And kill my machine. I can't kill Firefox because of UI frozen and CPU (4 cores) have high load.

Also I forgot to make backup of profile before use this addon. And now looks like all tabs lost.
#15 required. And some functionality required to manage tabs like Tree Style Tab but with function of bulk tabs moving between workspaces.

Tab Workspaces: 1.2.0
Firefox 57
Linux Mint 17.3 KDE

[Oplkill]

Same problem, but one of firefox addon has solved this problem, by adding option "Lazy loading tabs".
You can see example how this addon maked it. https://github.com/sienori/Tab-Session-Manager/tree/474157809e67ceb8ed8eac1b8df8bc533d1e26a0 (since 1.60 version)