I am running Ubuntu 21.10 on a Lenovo Thinkpad X1 Tablet.  I installed 
SageMath on my computer by cloning the git repository. I compiled sage 
using directions in README.md. The most recent version I compiled was 
SageMath 9.4. I use Firefox 98.0.2 (64-bit) as my browser.  

When I run ```sage -n jupyter file.ipynb```  A new tab opens in firefox 
with address ```file:///tmp/tmp9csp8qpp.html``` but Firefox reports 

> File not found
> 
> Firefox can’t find the file at
> /tmp/tmp9csp8qpp.html.
> 
>     Check the file name for capitalization or other typing errors.
>     Check to see if the file was moved, renamed or deleted.

However the file does exist.  ```ls -l /tmp/tmp9csp8qpp.html``` returns 

> -rw------- 1 brett brett 751 Mar 25 10:15 /tmp/tmp9csp8qpp.html

If I open the file in Firefox directly using ```Open File...``` from the 
File menu everything works fine.


When I run ```sage -n jupyter file.ipynb``` I get some other links in the 
terminal to use for opening the jupyter session in my browser:

>     To access the notebook, open this file in a browser:
>         
file:///home/brett/.local/share/jupyter/runtime/nbserver-101452-open.html
>     Or copy and paste one of these URLs:
>         
http://hamm:8888/?token=cb4036e78faba0faa3bd0d50b73cc7a94e302196c474d878
>      or 
http://127.0.0.1:8888/?token=cb4036e78faba0faa3bd0d50b73cc7a94e302196c474d878

If I open the first of these, Firefox reports

> Access to the file was denied
> 
> The file at
> /home/brett/.local/share/jupyter/runtime/nbserver-101452-open.html
> is not readable.
> 
>     It may have been removed, moved, or file permissions may be 
preventing access.

However I have both read and write privileges for this file: ```ls -l 
/home/brett/.local/share/jupyter/runtime/nbserver-101452-open.html``` 
returns

> -rw-rw-r-- 1 brett brett 667 Mar 25 10:15 
/home/brett/.local/share/jupyter/runtime/nbserver-101452-open.html

I tried changing the privileges to include ```x``` but Firefox still will 
not open it.

Like above if I open the file in Firefox using ```Open File...``` from the 
File menu everything works fine.

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