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I have used Thunderbird for decades and never had this kind of problem before. It seems to be stuck in a continual loop of downloading messages and compacting folders. This creates a problem because it dominates my internet connection. How do I alleviate the situation in version 78.10.0? It also seems like it always asked if I wanted to compact before just doing it.

I just downloaded Thunderbird on my new computer (HATE Windows Mail). I use gmail for my email. My mail DOES get sent out, but DOES NOT save to my SENT ITEMS folder. It starts the process, but cannot finish. It seems to get bogged down and can't complete.. How can I fix this?

As of this morning, I can't "get mail"... I get the "security exception" dialog stating the certificate belongs to a different site (which, it ALWAYS has) and giving me the option to permanently store the exception. Problem is, the exception IS already stored... it's just not WORKING any more. Certificate has NOT changed or expired, as near as I can tell... and this configuration was working for YEARS before this morning.

I was quite unhappy with the new Firefox Proton design, so I made a CSS file and copied the following code from a website. However, I don't know what to do to (1) slightly reduce the tab height, (2) get back tab borders for inactive tabs and (3) remove the small gaps between tabs. How exactly do I have to change the following code to do so (ideally, for convenience, please just complete the code accordingly)? Thanks in advance for any support!

/*** Tighten up drop-down/context/popup menu spacing (8 Sep 2021) ***/

menupopup:not(.in-menulist) > menuitem, 
menupopup:not(.in-menulist) > menu {
  padding-block: 2px !important; /* reduce to 3px, 2px, 1px or 0px as needed */ 
  min-height: unset !important; /* v92.0 - for padding below 4px */
}
:root {
  --arrowpanel-menuitem-padding: 4px 8px !important;
}

/*** Proton Tabs Tweaks ***/

/* Adjust tab corner shape, optionally remove space below tabs */

#tabbrowser-tabs {
    --user-tab-rounding: 6px;
}

.tab-background {
    border-radius: var(--user-tab-rounding) var(--user-tab-rounding) 0px 0px !important;
    margin-block: 1px 0 !important;
}
#scrollbutton-up, #scrollbutton-down { /* 6/10/2021 */
    border-top-width: 1px !important;
    border-bottom-width: 0 !important;
}
/* Container color bar visibility */
.tabbrowser-tab[usercontextid] > .tab-stack > .tab-background > .tab-context-line {
    margin: 0px max(calc(var(--user-tab-rounding) - 3px), 0px) !important;
}

I have 4 email addresses and therefore 4 TB folders. I would like to compact these folders but don't want to have to go to each folder and then each file to do this. Hence, how can I compact all folders simultaneously?

Any advice is greatly appreciated, thank you!