Computerhilfen tech-tips

If you have developed add-ons for Firefox and ran into the "manifest.json was not found" error – there's an easy solution for this! To publish a Firefox add-on them after successful testing, you may need to pack your add-on. Even if the unpacked add-on works locally (and manifest.json was found), it might not work after uploading it as a ZIP archive. Your add-on failed validation with 1 error. manifest.json was not foundThe solution t... Read more...

To save space on your desk, you can use your notebook as a monitor for a second PC: This way you only need one screen and have everything in view. Although you can't connect the second PC to the notebook's HDMI port to see its screen, this $20 trick is great if you only need to use the second PC occasionally (like to print documents, scan or run a specific program).Connecting one laptop to a second laptopConnect a desktop PC to a laptop&n... Read more...

Download our free icons to your phone and use them as WhatsApp stickers! Add a spooky touch to your messages for Halloween on October 31st with our Halloween icons or some romance with our Valentine's Day stickers! Spice up your messages with lots of icons and easily convert them to WhatsApp stickers! Our icon sets are perfect for use in letters, emails or in a messenger.To use them on Mac or PC, simply double-click on the ZIP archive to unzip it, ... Read more...

For presentations, letters and letterheads or office templates, we offer numerous arrows and office icons for free download: Since some of the icons have shadows, they work best on a light background. The arrows and office icons are in a ZIP archive and can be opened under Windows and MacOS by double-clicking: You can then drag and drop the desired icons into Word, PowerPoint, LibreOffice / OpenOffice and many other programs to insert them into a docum... Read more...

The Logitech K750 keyboard has two solar panels on the top that harness the sun's energy to power the keyboard for days, thanks to its rechargeable battery. This design allows you to continue using the keyboard even when sunlight is no longer available. However, like all rechargeable batteries, it will eventually need to be replaced.To replace the battery, turn the keyboard upside down with the keys facing the table. You'll notice a small opening i... Read more...

If you want to change the language of Google Chrome, you don't need to reinstall the browser. Changing the browser's language is very easy, and adding new languages is also very simple via the Preferences. There you will find an item called 'Languages'. If Chrome is set to a different language, follow our video guide and look for the icons and buttons to change the language.The different languages installed can be selected in the language selection and... Read more...

When you try to run the built-in Windows disk diagnostic tool CHKDSK ("Check Disk") from a regular command prompt, you may receive an error message that says you don't have sufficient privileges:"Access Denied as you do not have sufficient privileges or the disk may be locked by another process. You have to invoke this utility running in elevated mode and make sure the disk is unlocked."If you have administrator rights, you can work around this... Read more...

Websites protected by Cloudflare's web firewall may recently display [email protected] instead of an email address. This is to protect the mailbox from spam; the real address is supposed to be displayed in the browser via JavaScript. This does not seem to be working for several major browsers at the moment, so instead of the address, [email protected] is displayed, with a link to an explanation.You can work around this by turning off the Cloudflare... Read more...

By default, the Linux screenshot tool scrot in newer versions doesn't overwrite an existing file, even if you specify a filename. Instead, it creates a new file with an appended number, such as _000, _001, or _002. However, there is an easy way to make scrot overwrite the existing file with the given filename. This is particularly useful if you want to replace an old screenshot with a new one.To achieve this, simply add the -o option (for "overwrit... Read more...

No protocol specifiedError: Can’t open display: (null)Failed creating new xdo instanceIf you're using a Linux system, you might encounter this error message: "No protocol specified - Error: Can't open display". This might occur when trying to start a graphical application. The error indicates that you are unable to access the X server, which is responsible for displaying graphical content. In our example, we try to run the xdotool. ... Read more...