Multiproxy-Switch is a pretty nifty Firefox addon for quickly changing web proxies.
With the release of each new Firefox version, many older add-ons get culled from the typical profile due to incompatibilities. Multiproxy-Switch is no exception, and no longer seems to be updated.
I’ve taken this add-on on, modified it to be compatible with Firefox 4.0, and will now maintain it on github.
You can download the latest version from github.
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