1. A computing device comprising a processor and a memory, together implementing: a Just-In Time (JIT) compiler adapted to, receive at least one identified portion of a scripting language source code, the at least one identified portion of the scripting language source code comprising original context specific reference values, wherein context specific reference values comprise references to at least a portion of an object in a browsing context of the scripting language source code, replace each of the original context specific reference values with one or more placeholders, and generate a first JIT copy of the at least one identified portion of the scripting language source code, wherein the first JIT copy of the at least one identified portion of the scripting language source code comprises the one or more placeholders; an application adapted to, store the first JIT copy of the at least one identified portion of the scripting language source code, create a description of the original context specific reference values, wherein the description has one or more requirements, store the description of the original context specific reference values, access runtime information related to the original context specific reference values, compare the runtime information to the stored description of the original context specific reference values, obtain new context-specific reference values by using the runtime information when the runtime information satisfies the one more requirements, replace the one or more placeholders in the first JIT copy of the at least one identified portion with the new context-specific reference values, and use the JIT compiler to generate a second JIT copy of the at least one identified portion of the scripting language source code, wherein the second JIT copy of the at least one identified portion of the scripting language source code comprises the new context-specific reference values; and a scripting language Engine adapted to execute the second JIT copy of the at least one identified portion of the scripting language source code.