I was experiencing some freezes in vscode while deleting a file to the thrash, looks like is the KDE io problem, found this solution?
microsoft/vscode#90034 (comment)

create a file ~/.config/plasma-workspace/env/electron-trash-gio.sh with:

export ELECTRON_TRASH=gio

Setting Chromium in default applications for browser keeps opening Firefox for links in other apps like Discord and Konsole.

Found that xdg keeps firefox

$ xdg-settings get default-web-browser
firefox

and the BROWSER variable keeps pointing to firefox too:

$ echo $BROWSER
/usr/bin/firefox

Need to change both:

$ xdg-settings set default-web-browser chromium.desktop // the .desktop extension is needed
$ echo "export BROWSER=/usr/bin/chromium" >> .bashrc

Problem description

There is two problems that it solve:

• KDE get some lagging when two graphical things runs at same time, like open menu over a video, you can feel the video frame dropping.
• OBS flickers, some windows get full transparent for miliseconds, and without the composition full screen vsync it can be worse getting some cuts in windows.

How to fix

Change the composition settings in nvidia-settings may fix the problem

Saving settings to X config needs sudo

Change to disable in Gnome Tweaks > Keyboard&Mouse > Middle-click paste, to disable click paste in gnome apps

For Firefox, go to about:config and find by middlemouse.paste and set to false(this helped me a lot on Figma)

Source:
https://askubuntu.com/questions/4507/how-do-i-disable-middle-mouse-button-click-paste571aste571

This is caused by keychron is handled by a apple driver in linux, but you can change some settings to make it work, you can follow the tutorial here:
https://mikeshade.com/posts/keychron-linux-function-keys/

# temporary, to test what config you want, change 0, to 1 or 2
echo 2 | sudo tee /sys/module/hid_apple/parameters/fnmode

# to make it persist, change 0, to 1 or 2 here too
echo "options hid_apple fnmode=2" | sudo tee -a /etc/modprobe.d/hid_apple.conf

# for Ubuntu
sudo update-initramfs -u

# for Arch
sudo mkinitcpio -P 

IBus needs to be installed and the variables set

https://wiki.archlinux.org/title/IBus

Found on:
https://www.reddit.com/r/firefox/comments/va5psz/strange_mouse_behaviour_on_wayland/

Bug description:

• Cursor hovering doesn't change the cursor until click
• Selecting text doesn't select text until release

Add the variable
MOZ_ENABLE_WAYLAND=1 firefox

to keep the fix:
on ~/.bash_profile

if [ "$XDG_SESSION_TYPE" == "wayland" ]; then
    export MOZ_ENABLE_WAYLAND=1
fi

https://wiki.archlinux.org/title/firefox#Wayland

I got it when running Pamac, as Manjaro KDE uses Pamac-gtk it only scroll when pressing CTRL

Source and possible fix:
https://classicforum.manjaro.org/index.php?topic=8715.0

For Debian:
sudo apt install gnome-shell-extensions

For Arch(AUR):
yay -S gnome-browser-connector

Or install this to search extension directly in the extensions app
sudo apt install gnome-shell-extension-manager

source: https://itsfoss.com/gnome-shell-extensions/

this issues shows there is another file called 50-max_user_watches.conf that overrides the 40-max_user_watches.conf that is in most of docs about increase file watchers
guard/listen#444

so, to fix, just add the same to both files:

echo fs.inotify.max_user_watches=524288 | sudo tee /etc/sysctl.d/40-max-user-watches.conf && echo fs.inotify.max_user_watches=524288 | sudo tee /etc/sysctl.d/50-max_user_watches.conf && sudo sysctl --system

Looks like it a problem in KDE??

Install this extension
https://extensions.gnome.org/extension/1236/noannoyance/

In some computes the unique pixel column at left does not work as it would, it looks like behaving as it is a part of the active application window, not removing it's focus when clicked in it even when out of the active window.

Source and possible fix:
https://forum.manjaro.org/t/a-tiny-gap-margin-issue-kde/89325/27