How can I ask a multiple sentance question?

Question

Hi. I am a user of Firefox ever since I gave up on Netscape and there are a few features, the lack of which has been frustrating me.
Feature 1: I would like an option on the plug-in manager to disable or enable ad-ons for a specific browsing session. This could be adding "disable" and "enable" options to the current "always," "sometimes," and "never," options that currently exist that will revert to those other options the next time Firefox starts or it could be something else. I would be nice to be able to disable Adobe Flash for the remainder of a session without having to manually reenable it next time I start Firefox.
Feature 2: I am aware of the tab manager but I would like something a bit less complex. When I open so many tabs that they don't fit all at once on my window I would like a scroll bar above the tabs to augment the current clunky navigation options. Having a "fast forward" and "to the end" options in addition to the "forward" button could also solve this problem. (Similarly for the "backward button"). The multiple clicking of the "forward" and "backward" buttons are annoyingly imprecise.
Feature 3: I would like the combined "reload" "stop" button to be split or an option for it to be so. I have sometimes been frustrated when I went to click stop only to have the website stop before I actually clicked the button so now I'm reloading the website which often hinders what I was trying to achieve by clicking on stop (human reaction times being greater than 0). I am also frustrated by having these buttons combined when a website stops and starts multiple times (having a "stop and hold" or a "hold" button which would automatically click the stop button if it becomes active would also be a desirable feature). I also have a preference for keeping these buttons separate for aesthetical and lazy reasons even if it does take up a few more millimeters of my address bar.

Answer 1

Regarding Topic #1:
Firefox supports an optional preferences file named user.js which Firefox reads at startup. The settings in user.js override the changes you make to preferences during your session.
Starting in Firefox 24, I think, Firefox has preferences for how you want each plugin enabled: never, ask, always. So in theory, you could add a line to user.js to always enable Flash, and then if you disable it during your session, the next time you exit and restart Firefox, it should be enabled again. ''I haven't tried this myself.''
user_pref("plugin.state.flash", 2); //Always Enable
More info on the user.js file: http://kb.mozillazine.org/User.js_file
To learn the name of the preference, associated with a particular plugin, open the about:config preference editor in a new tab. To do that:
(1) In a new tab, type or paste '''about:config''' in the address bar and press Enter. Click the button promising to be careful.
(2) In the search box above the list, type or paste '''plugin''.''st''' and pause while the list is filtered. You may or may not see one or more plugin.state.* preferences already.
In a separate tab, open the Add-ons page to the Plugins section. To do that, use either:
* Ctrl+Shift+a
* orange Firefox button (or Tools menu) > Add-ons
In the left column, click Plugins.
Change the status of the plugin you want to learn about to "Never Activate". Then switch to the about:config tab and look for the plugin newly set to 0. Click that row to select it for future reference. To confirm that it's the right one, switch back to the add-ons page and set it to "Always Activate". Then switch to the about:config tab and confirm that the selected preference is now set to 2. If it checks out, that's the preference you want to add to your user.js file.
If you experiment with this, please report back on whether it works for you.