Also, for anyone who's willing to help, i've taken the liberty to do a "EtreCheck" report:
EtreCheck version: 3.0.3 (307)
Report generated 2016-09-08 20:28:49
Download EtreCheck from https://etrecheck.com
Runtime 2:06
Performance: Excellent
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Problem: Apps are crashing
Description:
Safari issues
Hardware Information:ⓘ
MacBook Air (13-inch, Early 2015)
[Technical Specifications] - [User Guide] - [Warranty & Service]
MacBook Air - model: MacBookAir7,2
1 1.6 GHz Intel Core i5 CPU: 2-core
4 GB RAM Not upgradeable
BANK 0/DIMM0
2 GB DDR3 1600 MHz ok
BANK 1/DIMM0
2 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en0: 802.11 a/b/g/n/ac
Battery: Health = Normal - Cycle count = 201
Video Information:ⓘ
Intel HD Graphics 6000
Color LCD 1440 x 900
System Software:ⓘ
OS X Yosemite 10.10.5 (14F1912) - Time since boot: less than an hour
Disk Information:ⓘ
APPLE SSD SM0256G disk0 : (251 GB) (Solid State - TRIM: Yes)
EFI (disk0s1) <not mounted> : 210 MB
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
Macintosh HD (disk1) / : 249.78 GB (126.81 GB free)
Core Storage: disk0s2 250.14 GB Online
USB Information:ⓘ
Apple Internal Memory Card Reader
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information:ⓘ
Apple Inc. thunderbolt_bus
Gatekeeper:ⓘ
Mac App Store and identified developers
System Launch Agents:ⓘ
[not loaded] 5 Apple tasks
[loaded] 148 Apple tasks
[running] 59 Apple tasks
System Launch Daemons:ⓘ
[not loaded] 47 Apple tasks
[loaded] 138 Apple tasks
[running] 77 Apple tasks
Launch Agents:ⓘ
[not loaded] com.oracle.java.Java-Updater.plist [Support]
Launch Daemons:ⓘ
[loaded] com.adobe.fpsaud.plist (2016-06-29) [Support]
[loaded] com.microsoft.office.licensing.helper.plist (2010-08-25) [Support]
[not loaded] com.oracle.java.Helper-Tool.plist [Support]
User Launch Agents:ⓘ
[loaded] com.bittorrent.uTorrent.plist (2015-04-23)
[loaded] com.google.keystone.agent.plist (2016-07-12) [Support]
User Login Items:ⓘ
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Internet Plug-ins:ⓘ
FlashPlayer-10.6: 22.0.0.209 - SDK 10.9 (2016-07-21) [Support]
QuickTime Plugin: 7.7.3 (2016-09-07)
Flash Player: 22.0.0.209 - SDK 10.9 (2016-07-21) Outdated! Update
Default Browser: 600 - SDK 10.10 (2015-09-03)
3rd Party Preference Panes:ⓘ
Flash Player (2016-06-29) [Support]
Time Machine:ⓘ
Time Machine not configured!
Top Processes by CPU:ⓘ
112% mdworker(6)
4% com.apple.WebKit.WebContent(5)
4% Safari
4% kernel_task
2% fontd
Top Processes by Memory:ⓘ
528 MB Google Chrome Helper(6)
467 MB com.apple.WebKit.WebContent(5)
430 MB kernel_task
180 MB imagent
123 MB Google Chrome
Virtual Memory Information:ⓘ
120 MB Free RAM
3.88 GB Used RAM (857 MB Cached)
0 B Swap Used
Diagnostics Information:ⓘ
Sep 8, 2016, 07:53:05 PM Self test - passed