Using RAM on Ubuntu for Firefox cache

[ash92]

Hi,

I am using "Ubuntu 22.04.5 LTS". I want to use the RAM for cached files by Firefox browser (version 130.0 (64-bit)). I setup "browser.cache.disk.parent_directory" in Firefox to "/run/user/1001" but it didn't use it. Then I tried giving it a value "/dev/shm", then also the size of cache is zero. What could be the reason. Is it a permissions issue. The User ID 1001 has permission to access both those directories AFAIK. The cache works if I don't set value for the parent_directory setting.
How can I get this to work? I didn't want to create a Ramdisk. Can I possibly use "/run/user/1001" or "/dev/shm" as temp space?

Regards
Amal

[ActionParsnip]

I've had a startup script that made a folder and chown'd it to my user, then a symlink for the browser cache to this folder. Worked OK. The folder creation needs adding to the startup because it live in RAM so is lost at power off.

[ActionParsnip]

Make the folder in

/tmp

(I assume you don't have /tmp mounted to a file system on your disk)

[ash92]

Thanks for your prompt replies. I don't think /tmp is mapped to RAM or any other writable directories except the two I mentioned. Here is the output of df -h.

Filesystem              Size  Used Avail Use% Mounted on
tmpfs                  1.6G  3.0M  1.6G   1%     /run
efivarfs                438K  193K  241K  45%    /sys/firmware/efi/efivars
/dev/nvme0n1p3           460G  219G  218G  51%   /
tmpfs                   7.7G  2.5G  5.3G  33%     /dev/shm
tmpfs                   5.0M  4.0K  5.0M   1%      /run/lock
/dev/nvme0n1p1           896M   72M  825M   8%     /boot/efi
tmpfs                   1.6G  1.7M  1.6G   1%      /run/user/1001

I thought /dev/shm is a good option as it has over 5Gb RAM free. Even /run/user/1001 has 1.5 Gb free.

[ActionParsnip]

Thanks for your prompt replies. I don't think /tmp is mapped to RAM or any other writable directories except the two I mentioned. Here is the output of df -h.

Filesystem              Size  Used Avail Use% Mounted on
tmpfs                  1.6G  3.0M  1.6G   1%     /run
efivarfs                438K  193K  241K  45%    /sys/firmware/efi/efivars
/dev/nvme0n1p3           460G  219G  218G  51%   /
tmpfs                   7.7G  2.5G  5.3G  33%     /dev/shm
tmpfs                   5.0M  4.0K  5.0M   1%      /run/lock
/dev/nvme0n1p1           896M   72M  825M   8%     /boot/efi
tmpfs                   1.6G  1.7M  1.6G   1%      /run/user/1001

I thought /dev/shm is a good option as it has over 5Gb RAM free. Even /run/user/1001 has 1.5 Gb free.

/run/user/1001/cache sounds sensible to me. You will need to make the folder after each boot.