AdventureQuest Inspect Element

Is there a way I can change the resistances / element modifiers of me or the monsters through the javascript:document.embeds[0].SetVariable thing?

no
you can only use it for changing the HP

Mana and SP too but they change back to normal on the monster's turn so just use it to 1shot bosses or something

Nah, you're wrong, you can change any variable in the game. But changing element modifiers messes them up.

javascript:document.embeds[0].SetVariable("_root.monster.intArmorWIND", 10000)

Also, to change SP/MP without making it return back you can do this:

javascript:document.embeds[0].SetVariable("_root.monster.intBaseSP", 0)