I can't see a good use for this, but nonetheless:

• Since you treat tabInfo as a list, why not have it be an array, this way you don't needtabInfoKey and you can usepush instead. Arrays are objects too.
• Don't use console.log for production code
• tab is a terrible name, go for either the Spartano orobject
• info is an unfortunate name, perhapsvalue ?
• tabInfo is also meh, perhapsobjectMap ?
• you should have a constructor for this!

Something like this incorporates my feedback:

function ObjectMap() {  this.entries = [];}ObjectMap.prototype.get = function( object ) {  for( var i = 0 , length = this.entries.length ; i < length ; i++ ){    if( this.entries[i].object === object ){      return this.entries[i].value;    }  }}ObjectMap.prototype.set = function( object, value ) {  //If we can find it, update it  for( var i = 0 , length = this.entries.length ; i < length ; i++ ){    if( this.entries[i].object === object ){      this.entries[i].value = value;      return;    }  }  //Otherwise, generate an entry      this.entries.push( { object : object , value : value } );}ObjectMap.prototype.remove = function( object ) {  for( var i = 0 , length = this.entries.length ; i < length ; i++ ){    if( this.entries[i].object === object ){      this.entries.splice( i , 1 );      return;    }  }}

You can then

o = new ObjectMap();o.set( o , "123" );o.get( o ); //Gives "123"o.remove( o );o.get( o ); //Gives nothing

Furthermore you should consider whether you want to allow function chaining, right now none of these functions return anything and it seems a shame.

• javascript
• hash-map