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Firefox Extension and Chrome Extension that replace Code

I need a chrome extension and a firefox extension both will need permissions to access all data on all websites the user visits.

The extensions will replace an a specific java script


if the website visited by user contains

then the extension will replace the script above to the following:

The original javascript ([url removed, login to view]) will never be executed and the new javascript will be properly executed as if the webpage contained it from the beginning.

The original javascript could change in some lines.

So I need several ifs (something around 15) if the original javascript has specific text on it.

I need to replace the javascript on each case for codes that I will give you.

Those codes needs to be loaded from an external file on my site. So that way I can change the codes whenever I like. (I accept suggestions on this feature, auto-update maybe could work [url removed, login to view] )

finally the extension needs to load an specific url, just 1 time (could be a 24 hours cookie) and into background. This will be only if the user is visiting my site.

Skills: Firefox, Google Chrome, Javascript

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About the Employer:
( 1 review ) Mexico, Mexico

Project ID: #4372013

Awarded to:


Consider it done! I'm a Web Developer with 6+ years of experience working and developing extensions for Chrome and Firefox. I've worked on projects similar to this one, and can complete it easily. Have a look at my fee More

$150 USD in 3 days
(13 Reviews)

4 freelancers are bidding on average $175 for this job


Hi! Please see my PM

$200 USD in 7 days
(5 Reviews)

Need more details about replacement javascript code.

$150 USD in 3 days
(10 Reviews)

I have some ideas. Please read my PM.

$200 USD in 3 days
(2 Reviews)