Proxy-server denied connection

I have here an acer 510 tablet with android 4.1.2 and firefox stable.
Very often I get the message "proxy-server denied connection, firefox was configured to use a proxy server that denied the connection" (or something like that, the device is non-english).
I don't know what is going on because on my computer and smaprthone firefox is working. Never saw this message on other devices. Every of these devices is also in the same Wifi Connection. What is this proxy? or who? I don't use any of this, did never configured firefox. Why is firefox working on other devices but not here? How to solve this problem?

Check to see if the wifi connection is different when you get this message, or see if there is a website that consistently is giving you this message. What you can do is clear the app data or clear the cache then reload the page to see if it is an old webpage as well.
You can also go to the about:config to see if there are any proxies configured by searching for proxy. Ideally though the network preferences should be taken from the device.
Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache.
The Firefox cache temporarily stores images, scripts, and other parts of websites while you are browsing. <br>
Note: ''This will temporarily log you out of all sites you're logged in to.''
To clear cache and cookies, do the following:
#Tap the menu icon located at the top right corner. This is the icon with 3 bars. On older Android devices you'll have to press the hardware menu key and then tap More.
#Tap '''Settings'''.
#After that, you will be taken to the settings screen. In the settings screen, look under the section '''''Privacy & Security''''' and select '''Clear private data'''.
#You will then be taken to a list of what can be cleared. Select the following 2 for deletion:
#*Cookies & active logins
#*Cache
#After those have been selected, tap the '''Clear data''' button to actually clear the cache and cookies.
Did this help you with your problems? Please let us know!

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