There has been a glitch - bug in the forum software for awhile, websites get marked up as code. For future reference, using the output of "inxi -r" and marking up as code stops - negates the code breakup example
paxmark@sway:~$ inxi -r
Repos: Active apt repos in: /etc/apt/sources.list
1: deb http://mirror.steadfast.net/debian/ unstable main contrib non-free
2: deb-src http://mirror.steadfast.net/debian/ unstable main contrib non-free
Note: this is on straight sid on the 10 y.o. atom. My sparky lxqt is the on other half of the dual boot
My output of what Pavroo asked you to do is (in Sid).
sudo apt install firefox
[sudo] password for paxmark:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
fonts-stix | otf-stix fonts-lmodern pulseaudio
The following NEW packages will be installed:
firefox
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 55.1 MB of archives.
After this operation, 210 MB of additional disk space will be used.
Get:1 http://mirror.steadfast.net/debian unstable/main i386 firefox i386 76.0.1-2 [55.1 MB]
Fetched 55.1 MB in 25s (2,237 kB/s)
Retrieving bug reports... Done
Parsing Found/Fixed information... Done
grave bugs of firefox (→ 76.0.1-2) <Outstanding>
b1 - #888423 - firefox: FF 58.0 segfaults each 1-2 minute
b2 - #909286 - firefox: "The bookmarks and history system will not be functional" message always
b3 - #931334 - firefox: leaks sensitive information between private windows
serious bugs of firefox (→ 76.0.1-2) <Outstanding>
b4 - #871947 - [firefox] Firefox 55 regression for vCenter WebClient 6.0
b5 - #915582 - Installs non-free binaries from cisco and google again
Summary:
firefox(5 bugs)
Are you sure you want to install/upgrade the above packages? [Y/n/?/...] sudo apt install firefox
Note: the graves and serious bugs do not appear to be that life threatening. Reading on bug 931334 is a good example - the reply to the first poster states why it is not as grave as stated.
Your mileage may vary (YMMV) as my example is in a straight Debian environment. It would not hurt for you to post what pavroo asked. "sudo apt install firefox" f