Firefox warnings

Should I worry about the Firefox warni开发者_Go百科ngs regarding jquery 1.5.2, f.x.

Warning: reference to undefined property a[d.expando]
Source File: http://localhost:51946/site/backend/script/jquery-1.5.2.min.js
Line: 16

or

Warning: reference to undefined property f[h]
Source File: http://localhost:51946/site/backend/script/jquery-1.5.2.min.js
Line: 16

Updating to the 1.8.0b6 version of firebug fixed the problem for me.