I always get the following error msg when trying to update add-ons "Invalid file hash (possible download corruption) -261"

I get the following error msg when I try to update add-ons ...
ErrorFirefox could not install the file at
http://releases.mozilla.org/pub/mozilla.org/addons/1865/adblock_plus-1.2.2-fx+sm+tb+fn.xpi
because: Invalid file hash (possible download corruption)
-261
Why, and is there a solution. Im fully patched on osx.
+ Fredrik

* "Clear the Cache": Firefox > Preferences > Advanced > Network > Offline Storage (Cache): "Clear Now"
* "Remove the Cookies" from sites causing problems: Firefox > Preferences > Privacy > Cookies: "Show Cookies"
You can also try to enable third-party cookies<br />
Firefox > Preferences > Privacy > Cookies: [X] "Accept third-party cookies"
See [[Disabling third party cookies]] (you need to enable)

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