My current Firefox version is 20.0.1. However, when I go to the Firefox addon site, it says that the version I use is Firefox 13, can someone help me?

I always upgrade to the latest version of Firefox. When I want to install addons, it says "not compatible with Firefox 13" but I'm on Firefox 20.0.1

Hello austin.z, you have installed the extension masking agent which is by replacing your agent user by 13 of firefox version. go to firefox/tools > addons > extensions and remove the extension. where the same issue is still present after reset your user agent as described in the sites say that Firefox is obsolete or incompatible, even if it's the latest version.

Tags: Firefox

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